Axial Lead Reed Switches High Power > MLRR-4 MLRR-4 15.2mm Sub-miniature Close Differential Reed Switch RoHS Description The MLRR-4 Reed Switch is a sub-miniature, normally open switch with a 15.24mm long x 2.54mm diameter (0.600” x 0.100”) glass envelope, and capable of switching 200Vdc at 20W with close differential (CD) characteristics. It has high insulation resistance of 1010 ohms minimum and contact resistance less than 100 milli-ohms. It can handle lamp loads up to 2W @ 14V with no suppression circuitry. This reed switch is also available in a surface mount version, that is, MLSM-4. Features • Sub-miniature normally open switch • Capable of switching 200Vdc or 1.0A at up to 20W • Close differential AT between PI and DO value Agency Approvals Agency Agency File Number Ampere-Turns Range E47258 E471070 17-38 AT DEMKO 14 ATEX 1393U 17-38 AT Dimensions • Available sensitivity range 17-38 AT • Capable of switching small incandescent lamp loads Benefits • Hermetically sealed switch contacts are not affected by and have no effect on their external environment • Zero operating power required for contact closure • Excellent for switching microcontroller logic level loads and small incandesent lamp loads Applications Dimensions in mm 20.19 (.795) REF. CL OF OVERLAP Ø2.66 (.105) MAX. 0.61 (0.024) DIA. REF. • Position Sensing • Security Systems • Level Sensing • Light Inductive Loads • Office Equipments • Lamp Loads up to 2W @ 14V Switch Type 12.19 (.480) MIN. 15.24 (.600) MAX. 40.38 (1.590) NOM. A (SPST-NO) Materials Body: Glass Leads: Tin Plated Nickel Iron Note: SPST-NO = Single-pole, single-throw, normally open Electrical Ratings Contact Rating Contact Form Watt - max. 20 Vdc - max. Vac - max. Vdc - min. 200 140 250 Carry Adc - max. Aac - max. Adc - max. 1.0 0.7 1.0 Resistance Contact, Initial Insulation Ω - max. Ω - min. 0.10 1010 Capacitance Contact pF - typ. 0.4 Temperature Operating Storage 5 °C °C -40 to +125 -65 to +125 Voltage 3 Current 3 1 Switching 2 Breakdown Switching 4 2 Notes: 1. Contact rating - Product of the switching voltage and current should never exceed the wattage rating. Contact Littelfuse for additional load/life information. 2. When switching inductive and/or capacitive loads, the effects of transient voltages and/or currents should be considered. Refer to Application Notes AN108A and AN107 for details. 3. Electrical Load Life Expectancy - Contact Littelfuse with voltage, current values along with type of load. 4. Breakdown Voltage - per MIL-STD-202, Method 301. 5. Storage Temperature - Long time exposure at elevated temperature may degrade solderability of the leads. © 2015 Littelfuse Specifications are subject to change without notice. littelfuse.com Axial Lead Reed Switches High Power > MLRR-4 MLRR-4 15.2mm Sub-miniature Close Differential Reed Switch Product Characteristics Operating Characteristics Operate Time 1 0.6ms - max. Release Time 1 0.2ms - max. Shock 11ms 1∕2 sine wave 2 Vibration 100G - max. 50-2000 Hertz 2 30G - max. Resonant Frequency 6.25kHz - typ. Magnetic Characteristics Pull-In Range Ampere Turns 3 Rating Sensitivity 17-38 Ampere Turns 4 20 Test Coil L4989 Notes: 1. Operate (including bounce)/Release Time - per EIA/NARM RS-421-A,diode suppressed coil (Coil II). 2. Shock and Vibration - per EIA/NARM RS-421-A and MIL-STD-202. 3. Pull-In Range - Contact Littelfuse for narrower AT ranges available. 4. Rating Sensitivity - The value at which contact ratings and operating characteristics are determined. Derating may be required below this value. 5. Custom modifications of forming and/or cutting of reed switches are available. Please contact Littelfuse. Drop-Out vs. Pull-In Chart Part Numbering System MLRR-4-17-23 40 Max. 35 Drop-Out (AT, L4989 Coil) 30 Min. Series 25 20 15 10 5 0 0 5 10 15 20 25 30 35 40 45 50 Pull-In (AT, L4989 Coil) Note: The chart represents the range of Drop-Out, minimum to maximum for a given Pull-In value. AT Range 17-23 AT 17-28 AT 22-28 AT 22-33 AT 27-33 AT 27-38 AT 32-38 AT Example: 17-23 AT product is MLRR-4-17-23 Note: This AT value is the before-modification value of the bare reed switch. Additional Information Datasheet Resources Samples Packaging Packaging Option Packaging Specification Bulk © 2015 Littelfuse Specifications are subject to change without notice. Bulk Quantity 3000 Quantity & Packaging Code N/A Taping Width N/A littelfuse.com