K “Standard Trip” Heater Elements for Ambient Temp. Comp. Bimetal Relays
Size
Heater
00, 0,
1 13/4
2, 2 1/2
3, 3 1/2 4 (JB) 4 (JG)
4 1/2, 5 6
Code
1.52-1.65 1.52-1.65
98-106 196-213 K21
1.66-1.79 1.66-1.79
107-115 214-231 K22
1.80-1.94 1.80-1.94
116-124 232-249 K23
1.95-2.15 1.95-2.15
125-136 250-273 K24
2.16-2.37 2.16-2.37
137-149 274-299 K26
2.38-2.56 2.38-2.56
150-160 300-321 K27
2.57-2.87 2.57-2.87
161-171 322-343 K28
2.88-3.13 2.88-3.13
172-192 344-385 K29
3.14-3.37 3.14-3.37
193-206 386-413
K31
3.38-3.72 3.38-3.72
207-228 414-457 K32
3.73-4.00 3.73-4.00
229-248 458-514 K33
4.01-4.35 4.01-4.35
515-563 K34
4.36-4.99 4.36-4.99
K36
5.00-5.38 5.00-5.38
K37
5.39-5.79 5.39-5.79
K39
5.80-6.43 5.80-6.43
K41
6.44-6.83 6.44-6.83
K42
6.84-7.83 6.84-7.83
K43
7.84-8.23 7.84-8.23
K49
8.24-9.59 8.24-9.59
K50
9.60-9.90 9.60-9.90 10.0-10.9
K52
10.0-10.7 10.0-10.7 11.0-12.0
K53
10.8-11.6 10.8-11.6 12.1-12.7
K54
11.7-12.3 11.7-12.3 12.8-13.5
K55
12.4-13.4 12.4-13.4 13.6-14.6
K56
13.5-14.2 13.5-14.2 14.7-15.9
14.3-15.6
K57
14.3-15.1 14.3-15.1 16.0-16.9
15.7-17.1
K58
15.2-17.5 15.2-17.5 17.0-18.2
17.2-18.9 18.9-20.4
K60
17.6-18.7 17.6-18.7 18.3-19.5
19.0-20.7 20.5-22.1
K61
18.8-20.0 18.8-20.0 19.6-20.9
20.8-22.8 22.2-24.3
K62
20.1-21.5 20.1-21.5 21.0-23.1
22.9-25.6 24.4-26.7
K63
21.6-23.9 21.6-23.9 23.2-25.4
25.7-27.6 26.8-29.3
K64
24.0-25.8 24.0-25.8 25.5-27.9
27.7-30.3 29.4-32.3
K67
25.9-29.5
30.4-33.3 32.4-35.5
K68
28.0-30.5
33.4-36.7 35.6-39.0
K69
29.6-32.7 30.6-33.5
36.8-40.0 39.1-42.9
K70
32.8-36.0 33.6-37.2
40.1-42.4 43.0-46.5
K72
37.3-40.7
42.5-46.3 46.6-50.9
K73
40.8-43.0
46.4-49.6 51.0-55.9
K74
43.1-47.9
49.7-52.3 56.0-59.1 49.7-52.3
K75
48.0-52.7
52.4-57.5 59.2-68.7 52.4-57.5
K76
52.8-58.3
57.6-63.9
57.6-63.0
K77
58.4-60.0
64.0-67.9 68.8-80.7 63.1-68.1
K78
68.0-74.3
68.2-74.3
K83
74.4-77.9 80.8-92.7 74.4-79.9
K85
78.0-83.1 92.8-103.9 80.0-87.4
K86
83.2-91.4 104.0-113.5 87.5-90.0
K87
91.5-99.9
90.1-100.0
K88
100.0-108 113.6-127.9 100.1-108.0
K89
108.1-119.0
K90
128.0-143.9 119.1-130.0
K92
144.0-163.9
K94
164.0-180.0
K96
Heaters shown in the table provide a maxi-
mum trip rating of 125% of the motor
nameplate amperes, which is suitable for
40°C motors. For all other motors select
heaters one code number lower than speci-
fied in the table, which give a maximum trip
rating of approximately 115%.
The tripping current of any heater in a 40°C
ambient is 25% greater than the lower value
of motor amperes shown in the table.
Starters do not provide protection from
short circuits. A protective device should be
provided in accordance with the NEC (CEC in
Canada) and not exceed the values shown in
the table.
Note: If the rating specified is not a standard
size for the circuit breaker manufacturer, use
the next largest size.
Hazardous Voltage.
Can cause death or serious
personal injury.
Automatic reset will continue to
reset on two-wire control. When
not desired, use three-wire con-
trol. Do not use manual trip but-
ton when relay is set in automat-
ic reset position.
Siemens Energy & Automation, Inc.
42
Wye-delta starters:
If the motor nameplate
shows the full load delta line current only,
divide this value by 1.73 or multiply by .58 to
select the proper heater rating.
*Ratings specified are for instantaneous
trip circuit breakers.
Maximum current rating for thermalmagnetic
circuit breakers is 250% of maximum heater
FLA.
Maximum current rating of fuses is:
a. 150% of maximum heater FLA for
Class R, K, or L (time delay).
b. 250% of maximum heater FLA for
Class K or L (non-time delay).
c. 300% of maximum heater FLA for
Class J (non-time delay).
If the calculated rating is between standard
sizes, the next larger size may be used. Fuse
size may not exceed switch size.
