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Copyright © 2020 Sensata Technologies, Inc.
OPERATING CHARACTERISTICS
Inrush Pulse Tolerance
Many circuit protector applications involve a transformer turn-on, an incandescent lamp load, or a capacitor charge from a DC source. Each of these
applications has one common factor: a steep transient of very high current amplitude and short duration. This takes the form of a spike or a single pulse
and is the cause of most nuisance tripping associated with magnetic circuit breakers.
SNAPAK® will withstand, without tripping, a single pulse of 8 milli-seconds duration (half sine wave configuration) and peak amplitude of 9 times its
rating without the inertia wheel and 13 times its rating with an inertia wheel. (Not applicable to instant trip delays).
MAXIMUM DCR AND IMPEDANCE
Current Ratings (Amps)
T/R/PP/PR DC Resistance
T/R/PP/PR 50/60Hz Impedance
CR/CPP/CPR DC Resistance
.100
175
181
274
.500
6.34
6.63
9.77
1.00
1.63
1.69
2.31
2.00
.400
.425
.465
3.00
.175
.188
.261
4.00
.103
.106
.156
5.00
.076
.078
.091
7.50
.038
.039
.053
10.0
.026
0.28
.023
12.5
.020
0.21
.020
15.0
.013
.014
.010
20.0
.010
.011
.008
25.0
.004
30.0
.003
PERCENTAGE OF RATED CURRENT VS TRIP TIME IN SECONDS AT +25°C (VERTICAL MOUNT)
Delay
100%
135%
150%
200%
400%
600%
800%
Instant
No Trip
May Trip
.100 Max
.100 Max
.100 Max
.100 Max
.100 Max
Fast
No Trip
.3 to 7
.2 to 5
.1 to 2
.03 to .50
.015 to .30
.010 to .150
Slow
No Trip
3 to 70
2 to 40
1 to 15
.10 to 4.0
.015 to 2.0
.010 to .800
PULSE TOLERANCE
Delay
Pulse Tolerance
1, 2, 61, 62
*9 Times Rated Current
3, 4, 61F, 62F
*13 Times Rated Current
400 Hz, DC, 50/60Hz Delay Curves (typ)
A choice of delays is offered for DC, 50/60Hz and 400Hz applications. Delays 0, 49, 59 and 69 provide fast-acting, instantaneous trip and are often
used to protect sensitive electronic equipment (not recommended where known inrush exists). Delays 1, 41, 51 and 61 have a short delay for general
purpose applications. Delays 2, 42, 52 and 62 are long enough to start certain types of motors and most transformer and capacitor loads.
Trip Free
Will trip open on overload, even when forcibly held on.This prevents operator from damaging the circuit by holding handle in the ON position.
Trip Indication
The operating handle moves forcibly and positively to the OFF position on overload.
DELAY CURVES & SPECIFICATIONS
DCR and Impedance is measured after 1 hour at 100% rated current using the Voltmeter-Ammeter Method
* Units above 15 amps are derated to 8 and 12 times rated current
* Minimum trip for all instantaneous and 400Hz units.
