1 description typical applications ordering information approvals technical data 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). motors, transformers, solenoids, extra low voltage wiring systems. 157-... for further details please see chapter: technical information voltage rating ac 250 v; dc 28 v (ul: ac 250 v; dc 50 v) current ratings 0.05...25 a typical life 0.05...16 a 5,000 operations at 2 x i n , inductive 17...25 a 5,000 operations at 2 x i n , resistive ambient temperature -20...+60 c (-4...+140 f) insulation co-ordination rated impulse pollution (iec 60664 and 60664 a) withstand voltage degree 2.5 kv 2 reinforced insulation in operating area dielectric strength (iec 60664 and 60664a) test voltage operating area ac 3,000 v insulation resistance > 100 m (dc 500 v) interrupting capacity i cn 0.05...2.5 a 8 x i n 3...5 a 20 x i n 6...12 a 200 a 13...25 a 300 a interrupting capacity i n u n (ul 1077) 0.05...20 a ac 250 v 2,000 a 0.05...25 a dc 50 v 2,500 a degree of protection operating area ip40 (iec 60529/din 40050) terminal area ip00 vibration 8 g (57-500 hz) 0.61 mm (10-57 hz) to iec 60068-2-6, test fc, 10 frequency cycles/axis shock 25 g (11 ms) to iec 60068-2-27, test ea corrosion 96 hours at 5 % salt mist, to iec 60068-2-11, test ka humidity 240 hours at 95 % rh to iec 60068-2-78, test cab mass approx. 24 g type no. 157 threadneck panel mounting (plastic knurled nut bulk shipped with 5 pcs plus) terminal design p10 blade terminals a6.3-0.8 (qc .250) k10 screw terminals m4x6 housing kf for tropical and high humidity conditions current ratings 0.05...25 a 157 - p10 - .. - 10 a ordering example standard current ratings and typical internal resistance values current rating (a) internal resistance () current rating (a) internal resistance () 0.05 280 3 0.1 0.08 100 3.5 0.06 0.1 110 4 0.06 0.2 29 4.5 0.05 0.3 14 5 0.05 0.4 7 6 0.02 0.5 4.9 7 0.02 0.6 3.4 8 0.02 0.7 2.5 10 < 0.02 0.8 1.8 12 < 0.02 1 1.2 13 < 0.02 1.2 0.8 15 < 0.02 1.5 0.6 16 < 0.02 1.8 0.2 20 < 0.02 2 0.3 22 < 0.02 2.5 0.2 25 < 0.02 authority standard rated voltage current ratings vde iec / en 60934 ac 250 v dc 28 v 0.05 a25 a 0.05 a20 a ul ul 1077 ac 250 v dc 50 v 0.05 a20 a 0.05 a25 a csa c22.2 no 235 ac 250 v dc 50 v 0.1 a20 a 0.1 a25 a cqc gb 17701 ac 250 v dc 28 v 0.05 a25 a 0.05 a25 a www.e-t-a.de thermal overcurrent circuit breaker 157 1646 1
2 the time/current characteristic curve depends on the ambient temperature 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. ambient temperature f c -4 -20 +14 -10 +32 0 +73.4 +23 +104 +40 +122 +50 +140 +60 derating factor 0.76 0.84 0.92 1 1.08 1.16 1.24 1 46 1 4 1 1 1 1 1 1 4 flat head screw m4x6 iso 1580 tightening torque max. 1.2 nm 9.4 .370 tightening torque max. 1 nm 3 / 8 -27uns-2 a 4 14 20 45 19.8 9.4 blade terminals din 46244-a6.3-0.8 (qc .250) 1.2 8 ?4 14.5 31 ?9.6 -0.1 8.9 -0.1 mounting hole .157 on .551 1.77 off .787 .780 .370 .157 .047 .315 .571 1.22 .378 -.004 .350 -.004 157-p10 157-k10 1 2 max. 5.4 35 1 operating area mounting area .039 1.38 max .213 this is a metric design and millimeter dimensions take precedence ( mm ) inch www.e-t-a.de thermal overcurrent circuit breaker 157 1646 1
3 connector bus links -p10 x 210 588 01 1 16 1 x 210 588 02 14 x 210 588 03 14 x 210 588 04 14 mounting sockets 10f-p10 16 10f-k10 10f-a10 16 a ccessories for sockets y 301 166 02 4 y 301 166 01 connector bus links -k10 x 210 589 01 14 x 210 589 02 1 16 1 1 6 464 ~2.76 ~70 50 pin lugs to din 46230 tinned copper ~2.76 ?2.5 .099 22.9 4.2 7.9 12.5 2.9 8.5 15 15 15 15 52. 9 .165 .311 .492 .114 .335 .591 .902 .591 .591 .591 2.08 2.95 68 21 22 11 12 blade terminals din 46244-a6.3-0.8 (qc .250) 8 2.68 .315 75 1 45 wire cross sectional areas 2 x max. 2.5 mm 2 (awg 14) stranded 2 x max. 4 mm 2 (awg 12) solid 1 30 21 22 11 12 5.6 9.5 50 7.5 15 75 12 13 6 12 7 .591 .296 .039 .039 .220 .374 1.97 1.77 .236 .472 .472 .276 .512 1.18 blade terminals din 46244-a6.3-0.8 (qc .250) 59 8 7 21 22 11 12 .315 .276 2.32 wire cross sectional areas 2 x max. 2.5 mm 2 (awg 14) stranded 2 x max. 4 mm 2 (awg 12) solid thickness = 0.8 mm .031 in. front panel water splash cover, transparent y 300 538 01 and knurled nut y 300 628 01 x 200 799 01 (bonded to nut) (ip64) front panel water splash cover, transparent with special knurled nut x 200 798 02 (bonded to nut) (ip64) 3/8-27 uns-2b 3/8-27 uns-2b 3/8-27 uns-2b splash cover (black) with hex nut (ip64) x 210 739 01 ?15 3 3/8-27uns-2b knurled nut 3/8" plastic (standard) y 307 117 02 .118 .591 accessories this is a metric design and millimeter dimensions take precedence ( mm ) inch all dimensions without tolerances are for reference only. in the interest of improved design, performance and cost effectiveness the right to make changes in these specifications without notice is reserved.product markings may not be exactly as the ordering codes. errors and omissions excepted. www.e-t-a.de thermal overcurrent circuit breaker 157 1646 1 thermal overcurrent circuit breaker 157
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