Thermal Overcurrent Circuit Breaker 157 Description Single pole thermal circuit breaker with push-to-reset, tease-free, trip-free, snap action mechanism (R-type TO CBE to EN 60934), threadneck panel mounting. The optional -KF housing is particularly suited to high humidity and other damp conditions. Approved to CBE standard EN 60934 (IEC 60934). Typical applications Motors, transformers, solenoids, extra low voltage wiring systems. 1 Ordering information 157-... Type No. 157 threadneck panel mounting (plastic knurled nut bulk shipped with 5 pcs plus) Technical data Terminal design P10 blade terminals A6.3-0.8 (QC .250) For further details please see: www.e-t-a.de/ti e K10 screw terminals M4x6 Voltage rating AC 250 V DC 28 V Housing (UL: AC 250 V DC 50 V) KF for tropical and high humidity conditions Current ratings Current ratings 0.05...25 A 0.05...25 A Typical life 0.05...16 A 5,000 operations at 2 x I , inductive N 17...25 A 5,000 operations at 2 x I , resistive N 157 - P10 - .. - 10 A ordering example Ambient temperature -20...+60 C (-4...+140 F) Please be informed that we have minimum ordering quantities to be Insulation co-ordination rated impulse pollution observed. (IEC 60664 and 60664 A) withstand voltage degree 2.5 kV 2 reinforced insulation in operating area Standard current ratings and typical internal resistance values Dielectric strength (IEC 60664 and 60664A) test voltage operating area AC 3,000 V Current Internal Current Internal Insulation resistance > 100 M (DC 500 V) rating (A) resistance () rating (A) resistance () Interrupting capacity I 0.05...2.5 A 8 x I cn N 3...5 A 20 x I N 0.05 280 3 0.1 6...12 A 200 A 13...25 A 300 A 0.08 100 3.5 0.06 Interrupting capacity I U N N 0.1 110 4 0.06 (UL 1077) 0.05...20 A AC 250 V 2,000 A 0.05...25 A DC 50 V 2,500 A 0.2 29 4.5 0.05 Degree of protection operating area IP40 (IEC 60529/DIN 40050) terminal area IP00 0.3 14 5 0.05 Vibration 8 g (57-500 Hz) 0.61 mm (10-57 Hz) to IEC 60068-2-6, test Fc, 0.4 7 6 0.02 10 frequency cycles/axis 0.5 4.9 7 0.02 Shock 25 g (11 ms) to IEC 60068-2-27, test Ea 0.6 3.4 8 0.02 Corrosion 96 hours at 5 % salt mist, to IEC 60068-2-11, test Ka 0.7 2.5 10 < 0.02 Humidity 240 hours at 95 % RH 0.8 1.8 12 < 0.02 to IEC 60068-2-78, test Cab Mass approx. 24 g 1 1.2 13 < 0.02 1.2 0.8 15 < 0.02 Approvals 1.5 0.6 16 < 0.02 Authority Standard Rated voltage Current ratings 1.8 0.2 20 < 0.02 VDE IEC / EN AC 250 V 0.05 A25 A 2 0.3 22 < 0.02 60934 DC 28 V 0.05 A20 A UL UL 1077 AC 250 V 0.05 A20 A 2.5 0.2 25 < 0.02 DC 50 V 0.05 A25 A CSA C22.2 No 235 AC 250 V 0.1 A20 A DC 50 V 0.1 A25 A CQC GB 17701 AC 250 V 0.05 A25 A DC 28 V 0.05 A25 A 1833 www.e-t-a.de 1Thermal Overcurrent Circuit Breaker 157 Typical time/current characteristics at +23 C/+73.4 F Dimensions 157-P10 10000 0.05 - 2.7 A 2.8 - 23 A tightening torque max. 1 Nm 3 / -27UNS-2 A 8 4 25 A .157 1000 100 1 10 blade terminals DIN 46244-A6.3-0.8 19.8 (QC .250) 1 .780 mounting hole 0.1 12 46 8102040 ... times rated current 31 9.6-0.1 The time/current characteristic curve depends on the ambient temperature 1.22 .378-.004 prevailing. In order to eliminate nuisance tripping, please multiply the circuit breaker current ratings by the derating factor shown below. See also section Technical information. -4 +14 +32 +73.4 +104 +122 +140 Ambient temperature F 157-K10 -20 -10 0 +23 +40 +50 +60 C 0.76 0.84 0.92 1 1.08 1.16 1.24 Derating factor Installation drawings flat head screw M4x6 ISO 1580 tightening torque max. 1.2 Nm operating area Internal connection diagram 1 1 .039 mounting area 2 mm This is a metric design and millimeter dimensions take precedence ( ) inch 2 www.e-t-a.de 1833 20 OFF .787 45 14 14.5 ON 9.4 1.77 .551 .571 .370 4 9.4 .157 .370 1.2 .047 8.9 -0.1 8 .350 -.004 .315 Trip time in seconds max. 5.4 max .213 35 1.38