Electromechanical magnetic switches Bernstein magnetic switches – the advantages ● reliability even under extreme ambient conditions. They are unaffected by dirt, humidity, gases, dust, etc. and operate completely free from wear and tear ● IP 67 protection ● repeatable switching point precision of approx. 0.1 mm ● may be operated from several directions ● can be mounted in any position ● electromechanical magnetic switches normally contain only a single component, thus ensuring high reliability ● easy to mount ● long electrical life (> 108 switching cycle lifetime if contacts are suitably protected) ● special types available for extreme temperature ranges (- 40° C to + 150° C) ● AC/DC switching Design, function and effect of an electromechanical magnetic switch The basic elements of this type of switch are the components which change their behaviour when approaching a magnet. The contact paddles invert their polarity (north and south pole) under the influence of a magnetic field. The approach can be made by either permanent magnets or electromagnets; the sensitivity of the switch and the field strength of the magnet determine the sensing distance. Correspondingly the approach or moving away of the magnet controls the opening and closing of the reed contacts. Normallyclosed, normally-open and changeover contacts are available in our range of products. The magnetic switches and their auxiliary components (resistors, diodes, triacs, output stages etc.) are cast in high-quality isolating material or casting compound to increase their resistance to vibration and to guarantee the protection class up to IP 67. For use under extreme ambient conditions such as wider temperature ranges, metal versions (non-corrosive steel, aluminium and brass) as well as standard plastic versions are available. Actuating direction Body (glass) N, H; or evaporated On On contact material FeNi paddle: Rhodium Actuating direction Detection area Construction of a reed contact Off Biasing On On On Bias magnets energise or hold the bistable or normally-closed contact closed, until a stronger magnet with opposite polarity neutralises the biasing. N.C. bistable “on-off” System: 1 System: 4 Actuating direction Detection area Off N.O. System: 2 bistable change-over On System: 5 change-over System: 3 Actuating direction Types of reed contacts bistable Actuation and switching behavior Switching behavior is principally determined by the movement and polarity of the magnet. The following drawings show typical characteristics. Body material and external dimensions are specified in the product overview. The magnetic switches with reed-contact output are identified by an „A“ in the second position of the type code (MA...). Switching frequency Up to 200 Hz, depending on the size of load to be switched (i. e. considerably faster than relays, contactors, etc.). 196 Detection area Off Switching distances Refer to tables of this catalogue to indentify which switching magnet may be used and therefore which minimum switching distance will be realised. Temperature ranges The standard version may be used in environments from – 5° C to + 70° C. Special types are also available offering an extended operating temperature range of – 40° C to + 150° C. In AC voltage applications, two solutions may be applied. 1) Voltage peaks induced by switching off inductive loads are suppressed by connecting a Voltage Dependent Resistor (VDR) in parallel to the reed contact. It should however be as large as possible to reduce the discharge current to a permissible value to ensure reliable contact protection. These considerations are also valid for charging capacitors. Electrical life Cable To maintain the long operational life of the electrical contacts, it is important to ensure the maximum supply voltage and maximum switching current are not exceeded. The following graphs show the load values for different contacts. Sensors Cable Relay Relay Guidelines for reed contact protection The values for current, performance and voltage specified in the catalogue are valid only for resisitive loads. Very often however, these loads will be used in conjunction with inductive or capacitive components when it is advisable to protect the reed contacts against voltage and current spikes. Whilst it is not possible to recommend a safe contact protection that applies to all load ranges (each individual case will require its own evaluation) we would like to present a general introduction to how reed contacts may be connected to different loads for improved operation. Suppression of reverse voltage peaks with a VDR 2) A Resistive/Capacitive (RC) element is connected in parallel to the contact, thus being in series with the load (vice versa is also possible). Relay 1. Inductive loads In DC voltage applications, contact protection is realised relatively easily with the help of a reverse polarity diode connected in parallel to the load. The diode polarity is selected so that it will block the normal operating voltage applied but will short-circuit any reverse voltage resulting from the switch being opened. (Note: these reverse voltage peaks can significantly exceed the normal operating voltage.) Relay Suppression of reverse voltage peaks with RC network Contact protection with resistors 2. Capacitive loads Using the selection matrix In contrast to inductive loads, increased making currents can occur in connection with capacitive loads and lamp loads. If charged capacitors are switched (including inherent cable capacities), a sudden discharge occurs that can damage and even weld contacts closed. The intensity of this discharge depends on the capacity and length of the cable leading to the switch but may be decreased by inserting a series resistor. The size of the resistor is determined by the characteristics of the corresponding switching circuit. To assist the user in selecting the right sensor for their application, Bernstein developed the following selection matrix. The individual fields match those in the product index to allow rapid selection of the most suitable sensor starting with the model description. By not using detailed technical descriptions the selection is considerably simplified. The corresponding output diagrams are shown on page 223. Suppression of reverse voltage peaks with a reverse polarity diode 197 Selection guide electromechanical magnetic switches in threaded and smooth barrels Switching capacity S/Imax. Model MA-30 ø 6 x 28 mm MA-46 ø 6.5 x 40 mm Switching voltage Umax. ø 12 x 86 mm MA-16 ø 12 x 86 mm MA-26 ø 12 x 92 mm MA-36 Output Housing material 10 VA/0.5 A 250 V 19 mm N.O. 5 VA/0.25 A 100 V 19 mm change over 20 VA/0.5 A 250 V 18 mm N.O. 20 VA/1 A 150 V on request change over 7 mm N.O. 250 V 10 mm change over 18 mm bistable 7 mm N.O. 12 mm change over 7 mm N.O. 12 mm change over 100 VA/3 A MA-06 Switching distance San 60 VA/1 A 250 VA/5 A 100 VA/3 A 250 V 60 VA/1 A 100 VA/3 A 250 V 60 VA/1 A Connection plastic PA 6.6 cable plastic PA 6 cable aluminium cable stainless steel cable plastic PA 6 cable 250 VA/5 A 250 V 13 mm bistable plastic PA 6.6 cable 80 VA/1 A 250 V 6 mm change over plastic PC plug 250 V 18 mm N.O. ø 13 x 108 mm MA-04 ø 15.5 x 145 mm MA-08 M 8 x 1 x 32 mm (Cable) M 8 x 1 x 40 mm (Plug) MA-18 M 12 x 1 x 60 mm MA-28 10 VA/3 A 100 V 20 VA/1 A stainless steel 13 mm change over plug 30 V 10 VA/0.5 A 18 mm N.O. 12 mm change over 250 V 60 VA/1 A cable brass, nickel-plated cable 60 VA/1 A 250 V 15 mm N.O. plastic PA cable 100 VA/3 A 250 V 6 mm N.O. brass, nickel-plated cable 7 mm N.O. 250 V 10 mm change over plastic PA 6 cable 22 mm bistable M 12 x 1 x 60 mm MA-23 M 12 x 1 x 80 mm 100 VA/3 A MA-33 M 12 x 1 x 80 mm MA-17 60 VA/1 A 250 VA/5 A 30 VA/0.5 A 250 V 12 mm change over plastic PA 6 cable 60 VA/1 A 250 V 17 mm change over brass, nickel-plated cable Pg 9 x 60 mm MA-43 Pg 9 x 80 mm 198 Smooth barrels MA-30, Ø 6 x 28 mm PA 6.6 MA-46, Ø 6.5 x 39 mm PA 6 MA-06, Ø 12 x 86 mm Al Switching distance (San) Referring magnet (page) Switching capacity (diagr.-no.) Max. switching voltage Switching function Special features 19 mm T-62N/S (212) 10 VA (4) 250 V N.O. Standard 18 mm T-62N/S (212) 20 VA (7) 250 V N.O. Standard 7 mm T-62N/S (212) 100 VA (11) 250 V N.O. Standard Designation MAK-3012-B-1 MAK-3013-X-1 MAK-4612-A-2 MAK-4613-3 MAA-0612-F-1 MAA-0613-L-1 MAA-0614-P-1 Part number 631.1230.571 631.0246.500 631.4206.246 Smooth barrels MA-06, Ø 12 x 86 mm Al MA-16, Ø 12 x 86 mm Stainless steel 1.4305 MA-16, Ø 12 x 86 mm Stainless steel 1.4305 Switching distance (San) Referring magnet (page) Switching capacity (diagr.-no.) Max. switching voltage Switching function Special features 16 mm T-62N/S (212) 60 VA (9) 250 V N.O. Temp. range 7 mm T-62N/S (212) 100 VA (11) 250 V N.O. Standard 7 mm T-62N/S (212) 100 VA (11) 250 V N.O. Temp. range 19 mm T-62N/S (212) 5 VA (2) 100 V change over Standard 631.0330.572 10 mm T-62N/S (212) 60 VA (9) 250 V change over Temp. range on request 20 VA (6) 150 V change over Standard 641.0346.336 12 mm T-62N/S (212) 60 VA (9) 250 V change over Standard -40 °C…+150 °C -40 °C…+150 °C 10 mm T-62N/S (212) 60 VA (9) 250 V change over Standard 631.6306.248 631.0406.554 -40 °C…+150 °C Designation MAA-0612-NT-4 MAA-0613-LT-1 MAN-1612-F-3 MAN-1613-L-1 MAN-1612-FT-8 Part number 641.0206.399 631.4216.476 631.4216.585 Smooth barrels MA-26, Ø 12 x 92 mm PA 6 MA-36, Ø 13 x 108 mm PA 6.6 MA-04, Ø 15.5 x 145 mm PC Switching distance (San) Referring magnet (page) Switching capacity (diagr.-no.) Max. switching voltage Switching function Special features 7 mm T-62N/S (212) 100 VA (11) 250 V N.O. Standard 12 mm T-62N/S (212) 60 VA (9) 250 V change over Standard 13 mm T-62N/S (212) 250 VA (12) 250 V bistable Standard 6 mm T-62N/S (212) 80 VA (10) 250 V change over plug Designation MAK-2612-F-1 MAK-2613-L-1 MAK-3614-P-2 MAK-0413-M-S Part number 631.4226.423 631.6326.426 631.0436.553 631.7304.313 631.6306.004 18 mm T-62N/S (212) 250 VA (12) 250 V bistable Standard 631.6316.259 Amphenol 199 Sensors Overview electromechanical magnetic switches in smooth barrels Overview electromechanical magnetic switches in threaded barrels Threaded barrels MA-08, M8 x 1 x 32 mm Stainless steel 1.4305 MA-08, M8 x 1 x 39 mm Stainless steel 1.4305 MA-18, M12 x 1 x 60 mm CuZn39Pb3 Switching distance (San) Referring magnet (page) Switching capacity (diagr.-no.) Max switching voltage Switching function Special features 18 mm T-62N/S (212) 10 VA (4) 250 V N.O. Standard 13 mm T-62N/S (212) 20 VA (5) 30 V change over plug Ø 6.5 18 mm T-62N/S (212) 10 VA (4) 250 V N.O. Standard Designation MAN-0812-B-1 MAN-0813-Y-1 MAN-0813-STK MAM-1812-B-1 MAM-1813-L-1 Part number 631.1208.596 631.0308.595 631.1218.294 Threaded barrels MA-28, M12 x 1 x 60 mm PA MA-23, M12 x 1 x 80 mm CuZn39Pb3 MA-33, M12 x 1 x 80 mm PA 6 Switching distance (San) Referring magnet (page) Switching capacity (diagr.-no.) Max switching voltage Switching function Special features 15 mm T-62N/S (212) 60 VA (9) 250 V N.O. Standard 7 mm T-62N/S (212) 100 VA (11) 250 V N.O. Standard 7 mm T-62N/S (212) 100 VA (11) 250 V N.O. Standard 10 mm T-62N/S (212) 60 VA (9) 250 V change over Standard Designation MAK-2812-L-3 MAM-2312-F-1 MAK-3312-F-2 MAK-3313-L-1 MAK-3314-P-2 Part number 641.6228.260 631.4223.268 631.4233.002 631.6333.005 641.0433.350 Threaded barrels MA-17, Pg 9 x 60 mm PA 6 MA-43, Pg 9 x 80 mm CuZn39Pb3 Switching distance (San) Referring magnet (page) Switching capacity (diagr.-no.) Max switching voltage Switching function Special features 12 mm T-62N/S (212) 30 VA (8) 250 V N.O. Standard 17 mm T-62N/S (212) 60 VA (9) 250 V change over Standard Designation MAK-1713-K-1 MAM-4313-L-2 Part number 631.5317.001 631.6343.544 200 13 mm T-62N/S (212) 10 VA (3) 100 V change over Standard 631.0308.597 12 mm T-62N/S (212) 60 VA (9) 250 V change over Standard 631.6318.002 22 mm T-62N/S (212) 250 VA (12) 250 V bistable Standard Selection guide electromechanical magnetic switches in rectangular housings Model Switching capacity S/Imax. MA-11 28.6 x 6.4 x 18 mm MA-01 Switching voltage Umax. Switching distance San Output Housing material 10 VA/0.5 A 250 V 10 mm N.O. 3 VA/0.25 A 130 V 8 mm change over 10 VA/0.5 A 250 V 25 mm bistable 10 VA/0.5 A 250 V 10 mm N.O. 10 mm N.O. 5 mm change over 18 mm N.O. 12 mm change over Connection plastic PA 6.6 cable plastic PA 6.6 cable plastic PA 6.6 cable plastic PC cable plastic PA 6 cable plastic PA 6.6 cable plastic PA 6.6 plug MA-45 45 x 9 x 25.5 mm MA-13 68 x 30 x 15 mm 10 VA/0.5 A 250 V 60 VA/1 A 10 VA/0.5 A 250 V 60 VA/1 A 100 VA/3 A MA-02 80 x 15 x 20 mm 30 VA/0.5 A 250 V 250 VA/5 A 100 VA/3 A MA-12 80 x 15 x 20 mm 250 V 60 VA/1 A 100 VA/3 A MA-44 80 x 15 x 30 mm MA-32 80 VA/1 A 250 V 250 VA/5 A 21 mm N.O. 18 mm change over 20 mm bistable 21 mm N.O. 24 mm change over 25 mm bistable 19 mm N.O. 22 mm change over 20 mm bistable 16 mm bistable cable 250 VA/5 A 250 V plastic PBT plug 85 x 24 x 26 mm 100 VA/3 A MA-42 88 x 13 x 25 mm 80 VA/1 A 250 V 250 VA/5 A 100 VA/3 A MA-03 105 x 25.5 x 58 mm Sensors 45 x 9 x 13 mm 80 VA/1 A 250 VA/5 A 250 V 25 mm N.O. 28 mm change over 20 mm bistable 10 mm N.O. 10 mm change over 15 mm bistable plastic PA 6.6 cable aluminium die casting screw termination 201 Overview electromechanical magnetic switches in rectangular housings Rectangular housings MA-11, 28.6 x 6.4 x 18 mm PA 6.6 MA-01, 45 x 9 x 13 mm PA 6.6 MA-45, 45 x 9 x 25.5 mm PA 6.6 Switching distance (San) Referring magnet (page) Switching capacity (diagr.-no.) Max. switching voltage Switching function Special features 10 mm TK-11-11 (229) 10 VA (4) 250 V N.O. Standard 10 mm TK-11-01 (229) 10 VA (4) 250 V N.O. Standard 10 mm TK-45 (229) 10 VA (4) 250 V N.O. Standard Designation MAK-1112-B-1 MAK-1113-1.5 MAK-1114-B-5 MAK-0112-B-1 MAK-4512-B-1 MAK-4513-L-1 Part number 631.1211.541 631.1201.288 631.1245.539 Rectangular housings MA-13, 68 x 30 x 15 mm PC MA-02, 80 x 15 x 20 mm PA 6.6 MA-02, 80 x 15 x 20 mm GDAlSi 12 Switching distance (San) Referring magnet (page) Switching capacity (diagr.-no.) Max. switching voltage Switching function Special features 8 mm T-62N/S (212) 60 VA (9) 250 V N.O. Standard 21 mm TK-21-02 (229) 100 VA (11) 250 V N.O. Standard 18 mm TK-21-02 (229) 30 VA (8) 250 V change over Standard Designation MAK-1313-L-1 MAK-0212-F-1 MAK-0213-K-1 MAK-0214-P-3 MAA-0212-FT-5 MAA-0213-LT-1 Part number 631.6313.004 631.4202.204 631.5302.309 Rectangular housings MA-12, 80 x 15 x 20 mm PA 6.6 MA-44, 80 x 15 x 30 mm PA 6.6 Switching distance (San) Referring magnet (page) Switching capacity (diagr.-no.) Max. switching voltage Switching function Special features 21 mm TK-21-12 (229) 100 VA (11) 250 V N.O. Standard 24 mm 25 mm TK-21-12 (229) T-62N/S (212) 60 VA (9) 60 VA (9) 250 V 250 V change over bistable Standard Standard 19 mm TK-44 (229) 100 VA (11) 250 V N.O. Standard 22 mm TK-44 (229) 80 VA (10) 250 V change over Standard Designation MAK-1212-F-1 MAK-1213-L-1 MAK-1214-L-2 MAK-4412-F-1 Part number 631.4212.217 631.6312.220 641.0412.143 631.4244.536 8 mm 25 mm TK-11-11 (229)T-67N/S 3 VA (1) 10 VA (4) 130 V 250 V change over bistable Standard Standard 641.0311.368 631.1411.603 20 mm T-62N/S 250 VA (12) 250 V bistable Standard 10 mm T-62N/S (212) 100 VA (11) 250 V N.O. Temp. range 5 mm TK-45 (229) 60 VA (9) 250 V change over Standard 631.6345.540 30 mm T-62N/S (212) 60 VA (9) 250 V change over Temp. range -40 °C…+150 °C -40 °C…+150 °C 202 641.9402.397 631.4202.522 631.6302.389 MA-32, 85 x 24 x 26 mm PBT 20 mm T-62N/S (212) 250 VA (12) 250 V bistable Standard 15 mm T-67N/S 100 VA (11) 250 V bistable Standard 16 mm T-62N/S (212) 250 VA (12) 250 V bistable Standard MAK-4413-M-1 MAK-4414-P-2 MAK-3214-F-3 MAK-3214-P-1 631.7344.538 631.0444.562 631.4432.609 631.0432.598 Overview electromechanical magnetic switches in rectangular housings MA-32, 85 x 24 x 26 mm PBT MA-42, 88 x 13 x 25 mm PA 6.6 MA-03, 100 x 29.5 x 58 mm GK-AlSi 12 Switching distance (San) Referring magnet (page) Switching capacity (diagr.-no.) Max. switching voltage Switching function Special features 15 mm T-62N/S 100 VA (11) 250 V bistable plug flat plug 6.3 16 mm T-62N/S (212) 250 VA (12) 250 V bistable plug flat plug 4.8 25 mm TK-42 (213) 100 VA (11) 250 V N.O. Standard 22 mm TK-42 (213) 80 VA (10) 250 V change over Standard 20 mm T-62N/S (212) 250 VA (12) 250 V bistable Standard 10 mm TA-31 (214) 100 VA (11) 250 V N.O. Standard 10 mm TA-31 (214) 80 VA (10) 250 V change over Standard Designation MAK-3214-F-STK 6.3 MAK-3214-P-STK 4.8 MAK-4212-F-1 MAK-4213-M-1 MAK-4214-P-1 MAA-0312-F MAA-0313-M MAA-0314-P Part number 631.4432.612 631.0432.590 631.4242.533 631.7342.535 631.0442.534 631.4203.232 631.7303.312 631.9403.532 15 mm T-62N/S (212) 250 VA (12) 250 V bistable Standard Technical data standard versions electromechanical magnetic switches Switching current Temperature range Protection class (IEC 529, EN 60 529) Repeatable accuracy Mech. operational life see output diagram -5 °C…+70 °C IP 67 ≈ ± 0.1 mm > 3 x 108 switching cycles Output diagrams electromechanical magnetic switches U[V] 3 VA 130 U [V] I [A] 24 48 120 230 0,125 0,063 0,025 - U[V] 5 VA 100 U [V] I [A] 24 48 120 230 0,125 0,104 - 20 U[V] 10 VA 100 U [V] I [A] 24 48 120 230 0,417 0,208 - I [A] 24 48 120 230 0,417 0,208 0,083 0,043 20 0,500 I[A] 0 0 0,250 I[A] 0,050 (2) 20 VA 250 U [V] I [A] 24 48 120 230 0,833 0,417 0,167 0,087 U[V] 0 0,500 I[A] 0,100 (3) 30 VA 250 U [V] I [A] 24 48 120 230 0,500 0,500 0,250 0,130 60 U[V] 0 (7) 12 24 48 I [A] 1,000 0,833 - (4) 60 VA 250 U [V] I [A] 24 48 120 230 1,000 1,000 0,500 0,261 U[V] 0,667 1,000 I[A] (5) 0,080 0 (8) 0,120 0 (9) U [V] I [A] 24 48 120 230 0,833 0,417 0,167 - 80 VA 250 U [V] I [A] 24 48 120 230 1,000 1,000 0,667 0,348 0 1,000 I[A] 0,133 100 VA U[V] 250 U [V] I [A] 24 48 120 230 3,000 2,083 0,833 0,435 U[V] 250 VA 250 U [V] I [A] 24 48 120 230 5,000 5,000 2,083 1,087 80 60 0,500 I[A] 20 VA (6) 50 33,333 1,000 I[A] U[V] 150 20 0,040 20 0 U [V] 30 20 0,250 I[A] 0,023 (1) U[V] 20 VA U[V] U [V] 20 12 0 10 VA U[V] 250 0,240 1,000 I[A] 0 (10) 0,320 1,000 I[A] 0 0,400 (11) 3,000 I[A] 0 1,000 5,000 I[A] (12) 203 Sensors Rectangular housings Dimension diagrams magnetic switches MA-01 Page 202 MA-02 Page 202 MA-03 Page 203 MA-04 Page 199 cable version plug version MA-06 Page 199 MA-08 Page 200 MA-11 Page 202 MA-12 Page 202 MA-13 Page 202 MA-16 Page 199 MA-17 Page 200 MA-18 Page 200 MA-23 Page 200 MA-26 Page 199 MA-28 Page 200 MA-30 Page 199 208 MA-32 (cable) Page 202 MA-32 (plug) Page 203 MA-33 Page 200 MA-36 Page 199 MA-42 Page 203 MA-43 Page 200 MA-44 Page 202 MA-45 Page 202 Page 207 MA-61 Page 206 active surface active surface MA-46 Page 199 MA-52 Page 207 MA-55 active surface MA-62 Page 206 MA-63 Page 206 MA-70 Page 206 MA-80 Page 207 209 Sensors flat plug