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Full Voltage Contactors and Starters—NEMA Rated

Class 8502, 8536 / Refer to Catalog 8502CT9701

Application Data for Selection

 

Table 16.44:

NEMA Size	Load Voltage	Maximum Hp Rating— Nonplugging and Nonjogging Duty		Maximum Hp Rating— Plugging and Jogging Duty a		Continuous Current Rating, Amperes— 600 Volt Max.	Service— Limit Current Rating, Amperes b	Tungsten and Infrared Lamp Load, Amperes— 250 Volts Max. c	Resistance Heating Loads, KW— other than Infrared Lamp Loads d		KVA Rating for Switching Transformer Primaries at 50 or 60 Cycles				3Ø Rating for Switching Capacitors e
											Transformers Having Inrush Currents (Worst Case Peak) of Not More Than 20 Times Peak of Continuous Current Rating		Transformers Having Inrush Currents (Worst Case Peak) of Over 20 Through 40 Times Peak of Continuous Current Rating
		Single Phase	Poly- Phase	Single Phase	Poly- Phase				Single Phase	Poly- Phase	Single Phase	Poly- Phase	Single Phase	Poly- Phase	KVAR
00	115 200 230 380 460 575	1/2 —  1 — — —	—    1-1/2   1-1/2    1-1/2   2   2	— — — — — —	— — — — — —	9   9   9   9   9   9	11  11  11  11  11  11	5 5 5 — — —	— — — — — —	— — — — — —	— — — — — —	— — — — — —	— — — — — —	— — — — — —	— — — — — —
0	115 200 230 380 460 575	1  —  2  — — —	—   3    3    5    5    5	1/2 —  1  — — —	— 1-1/2 11/2- 11/2 2  2	18  18  18  18  18  18	21  21  21  21  21  21	10 10 10 — — —	— — — — — —	— — — — — —	0.6 —   1.2 —   2.4   3.0	—   1.8   2.1 —   4.2   5.2	0.3 —  0.6 —  1.2  1.5	—   0.9   1.0 —   2.1   2.6	— — — — — —
1	115 200 230 380 460 575	2  —  3  — — —	— 7-1/2 7-1/2  10  10  10	1  — 2  — — —	— 3  3  5  5  5	27  27  27  27  27  27	32  32  32  32  32  32	15 15 15 — — —	3 —   6 —  12  15	5   9.1  10  16.5  20  25	1.2 —   2.4 —   4.9   6.2	—   3.6   4.3 —   8.5  11.0	0.6 —  1.2 —  2.5  3.1	—   1.8   2.1 —   4.3   5.3	— — — — — —
1P	115 230	3   5	— —	1-1/2 3	— —	36  36	42  42	24  24	— —	— —	— —	— —	— —	— —	— —
2	115 200 230 380 460 575	3  — 7-1/2 — — —	—  10   15   25   25   25	2  — 5  — — —	— 7-1/2 10  15  15  15	45  45  45  45  45  45	52  52  52  52  52  52	30  30  30 — — —	5 —  10 —  20  25	8.5  15.4  17  28  34  43	2.1 —   4.1 —   8.3  10.0	—   6.3   7.2 —  14  18	1.0 —  2.1 —  4.2  5.2	—   3.1   3.6 —   7.2   8.9	— —   8 —  16  20
3	115 200 230 380 460 575	— — — — — —	—  25   30   50   50   50	— — — — — —	—  15   20   30   30   30	90  90  90  90  90  90	104 104 104 104 104 104	60  60  60 — — —	10 —  20 —  40  50	17  31  34  56  68  86	4.1 —   8.1 —  16  20	—  12  14 —  28  35	2.0 —  4.1 —  8.1 10	—   6.1   7.0 —  14  18	— —  27 —  53  67
4	200 230 380 460 575	— — — — —	40   50   75  100  100	— — — — —	25   30   50   60   60	135 135 135 135 135	156 156 156 156 156	120 120 — — —	—  30 —  60  75	45  52  86.7 105 130	—  14 —  27  34	20  23 —  47  59	—  6.8 — 14 17	10  12 —  23  29	—  40 —  80 100
5	200 230 380 460 575	— — — — —	75  100  150  200  200	— — — — —	60   75  125  150  150	270 270 270 270 270	311 311 311 311 311	240 240 — — —	—  60 — 120 150	91 105 173 210 260	—  27 — 54 68	41  47 —  94 117	— 14 — 27 34	20  24 —  47  59	—  80 — 160 200
6 f	200 230 380 460 575	— — — — —	150  200  300  400  400	— — — — —	125  150  250  300  300	540 540 540 540 540	621 621 621 621 621	480 480 — — —	— 120 — 240 300	182 210 342 415 515	—  54 — 108 135	81  94 — 188 234	— 27 — 54 68	41  47 —  94 117	— 160 — 320 400
7f	230 460 575	— — —	300  600  600	— — —	— — —	810 810 810	932 932 932	— — —	180 360 450	315 625 775	— — —	— — —	— — —	— — —	240 480 600

Tables and footnotes are taken from NEMA Standards.

a

Ratings shown are for applications requiring repeated interruptions of stalled motor current or repeated closing of high transient currents encountered in rapid motor reversal, involving more than five openings or closings per minute and more than ten in a ten-minute period, such as plug-stop, plug-reverse or jogging duty. Ratings apply to single speed and multi-speed controllers.

b

Per NEMA Standards paragraph ICS 2-321.20, the service-limit current represents the maximum rms current, in Amperes, which the controller may be expected to carry for protracted periods in normal service. At service-limit current ratings, temperature rises may exceed those obtained by testing the controller at its continuous current rating. The ultimate trip current of over-current (overload) relays or other motor protective devices shall not exceed the service-limit current ratings of the controller.

c

FLUORESCENT LAMP LOADS—300 VOLTS AND LESS—The characteristics of fluorescent lamps are such that it is not necessary to derate Class 8502 contactors below their normal continuous current rating. Class 8903 contactors may also be used with fluorescent lamp loads. For controlling tungsten and infrared lamp loads, and resistance heating loads, Class 8903 AC lighting contactors are recommended. These contactors are specifically designed for such loads and are applied at their full rating as listed in the Class 8903 Section.

d	Ratings apply to contactors which are employed to switch the load at the utilization voltage of the heat producing element with a duty which requires continuous operation of not more than five openings per minute. Class 8903 Types L and S lighting contactors are rated for resistance heating loads.

e

When discharged, a capacitor has essentially zero impedance. For repetitive switching by a contactor, sufficient impedance should be connected in series to limit inrush current to not more than 6 times the contactor rated continuous current. In many installations, the impedance of connecting conductors may be sufficient for this purpose. When switching to connect additional banks, the banks already on the line may be charged and can supply additional available short-circuit current which should be considered when selecting the impedance to limit the current. The ratings for capacitor switching above assume the following maximum available fault currents:

■	NEMA Size 00–3: 5,000 A RMS Sym.

■	NEMA Size 4–5: 10,000 A RMS Sym.

■	NEMA Size 6: 18,000 A RMS Sym.

■	NEMA Size 7: 30,000 A RMS Sym.

If available fault current is greater than these values, connect sufficient impedance in series as noted in the previous paragraph.

f	For NEMA Size 6 & 7, the operation rate is as follows: Continuous operation rate is 3 operations per minute maximum; Jogging or Plugging Duty operation rate is 15 operations per minute for a maximum of three minutes.

The motor ratings in