Bulletin 1492 Circuit Protection Supplementary Protectors (Miniature Circuit Breakers), Continued 1492-GH, Continued UL, CSA, and IEC Rated Selection Guide — To select a miniature circuit breaker, use the following procedure: • Determine the inrush correction factor from Table 1. • Determine the temperature correction factor from Table 2. • Determine the sealed current of the load being protected. • Multiply the sealed current by the two correction factors and select the closest higher ampere rating. Example — What size miniature circuit breaker should be selected for a solenoid with sealed current of 0.5 A, an inrush ratio of 1:8, and an ambient temperature of +110°F (43.7°C)? 0.5 x 1.7 x 1.15 = 0.9775 Select the 1.0 A miniature circuit breaker. Table 1. Inrush Ratio Correction Table Inrush Ratio 1:1 to 1:4 1:5 1:6 1:7 1:8 1.3 1.4 1.5 1.6 1.7 Factor Note: For resistive loads, use inrush correction factor of 1.0. Table 2. Ambient Temperature Correction Table Ambient Temperature 70°F (21.1°C) 100°F (37.8°C) 120°F (48.9°C) 140°F (60°C) 160°F (71.1°C) 180°F (82.2°C) 200°F (93.3°C) 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Factor Tripping time of the miniature circuit breaker is determined from Table 3 below. Divide the miniature circuit breaker value by the temperature correction factor from Table 2 above to determine the actual rated current referenced in Table 3. Table 3. Tripping Time Tripping Times in Seconds at 70°F (21.1°C) Percent Rated Current 100% 200% 300% 400% 500% 600% 1000% 2000% Greater No Trip 10…40 3…18 1.5…9 0.8…6 0.003…4 0.003…2 Maximum 0.02 Tripping Times (Seconds) Note: When several breakers are rail mounted adjacent to each other, the no-trip current will be 80% of rated current at 70°F (21.1°C). Trip Current 10000 8000 6000 4000 3000 2000 Trip current is 140% of rated current. Protector will hold 100% of rated current indefinitely. Will trip within one hour at 140% of rated current. 1000 800 600 400 300 200 0.05 to 7.5 amp 10 8 6 4 3 2 1 .800 .600 .400 .300 .200 8 to 15 amp SECONDS TRIPPING TIME AT 70 F 100 80 60 40 30 20 ° .100 .080 .060 .040 .030 .020 .010 .008 .006 .004 .003 .002 80 70 60 50 100 150 200 300 800 700 600 500 400 1000 1500 2000 3000 4000 6000 5000 8000 10000 .001 PERCENT RATED CURRENT 111 Bulletin 1492 Circuit Protection Supplementary Protectors (Miniature Circuit Breakers), Continued 1492-GH, Continued Specifications ➊ Cat. No. 1492-GH Series B Description 1-pole with universal mounting foot for Allen-Bradley and DIN Rail mounting 250V AC 50/60 Hz 65V DC Maximum Voltage Ratings Standard Current Ratings Internal Resistance per Pole A Ω 0.2 44 0.5 6.6 0.8 2.55 1.0 1.97 1.2 1.22 1.5 0.86 Dielectric Strength 2.0 0.49 2.5 3.0 4.0 5.0 7.0 10.0 15.0 0.313 0.205 0.104 0.082 0.034 <0.20 <0.20 1500V AC Shock: 25 G, 11 ms duration Vibration: 5 G (10…500 Hz) Shock and Vibration Specifications Insulation Resistance 100 MΩ @ 500V DC 6000 cycles @ rated current (UL 1077) 4000 cycles @ 200% rated current Operating Life Temperature Range –40…+149°F (–40…+65°C) Housing Material Glass-filled Polyamide 6.6 #22…#10 AWG (0.5…6 mm2) Wire Size Recommended Wire Strip Length 0.44" (11.2 mm) Terminals Tubular screw with self-lifting box lug Recommended Tightening Torque 10…12 lb-in. (1.13…1.4 Nm) ➊ Performance Data — See Publication A113, page Important-2. Approvals • UL 1077 • CSA 22.2 NO. 235 • VDE 0631 (IEC 60934) In North America, the Cat. No. 1492-GH miniature circuit breaker is rated as a Supplementary Protector with a short-circuit current rating. Internationally, it is rated by IEC as a Circuit Breaker for Equipment with an interrupt rating. Electrical Characteristics Voltage Rating Short-Circuit Current Rating ➊ Interrupt Rating Icn (IEC only) Poles Rated Current (A) 1 0.2…15 250 — 1 0.2…15 — 80 1 kA, U1 1 9…14 250 — 2 kA, C1 1 0.2…15 AC DC UL 1077/CSA 22.2 #235 Supplementary Protector Rating 1 kA, U1 VDE 0631 (IEC 60934) Circuit Breaker for Equipment Ratings 250 65 0.2 kA, but not to exceed 100 x In ➊ The short-circuit current rating is followed by a letter and number designating the test conditions and any calibrations and dielectric tests following the short-circuit test. These designations are defined as follows (see ➋ also): C — Indicates that the short-circuit test was conducted with series overcurrent protection U — Indicates that the short-circuit test was conducted without series overcurrent protection 1 — Indicates that a recalibration and dielectric test was not conducted as part of the short-circuit test 2 — Indicates that a recalibration and dielectric test was conducted as part of the short-circuit test ➋ These alphanumeric designations were established by UL. CSA has not yet adopted them; however, the test conditions are equivalent to UL and the coding is appropriate. 112