Westinghouse 30-471 (E) 30-471 E, Interrupting, Closing and Withstand Rating - Robonic Type A

Instruction Leaflet

30-471 (E)

Page 7

Table 1 — Interrupting, Closing and Withstand Rating — Robonic Type A

Robonic			rms symmetrical amperes
Continuous	Type	600 Vac	480 Vac	120,208,240 Vac
Rating
30 to 100 amps	LRO	14,000	14,000	18,000
150 to 225 amps	RO	22,000	22,000	25,000
300 to 1000 amps	RO	22,000	30,000	42,000
1200 to 3000 amps	PRO	65,000	65,000	125,000

Since type A Robonics employ magnetic only breakers, their interrupt- ing, closing and withstand ratings are the same value. Under fault

conditions, with it’s “normal” breaker closed, a Robonic is required to withstand the energy let through of the normal service protective device while the fault is being cleared. At the same time, should the normal voltage fall below the voltage sensing relay’s selected value, - and if the alternate source were available, the Robonic could transfer before the normal service protective device cleared the fault.

This would require that the Robonic be capable of interrupting the protective device’s let through current. In addition, the Robonic could be required to close in on a fault. Thus can be seen the need for Robonics to have, interrupting, closing and withstand ratings.

The interrupting, closing and withstand ratings shown in Table 1 are those for standard type A Robonics. For higher values, consideration can be given to use of Robonics built with Mark 75, Tri-Pac or SCB breakers.

Table 2 — Maximum Upstream Circuit Protective Devices for

Type A Robonics, All Classes of Loads

Robonic		Maximum Upstream	Maximum Upstream
			Fuse-Rating¬
Type	Continuous	Breaker Frame Size	Class	Class
	Rating		J or L	K5 or R
	(amps)
LRO	30	EB, EHB, FB, HFB, FB-P	100	100
LRO	70	EB, EHB, FB, HFB, FB-P	100	100
LRO	100	FB, HFB	100	100
RO	150	CA,CAH,JA,KA,HKA,LC,HLC,LA-P	225	225
RO	200	DA, LBB, LB, HLB, LC, HLC, LA-P	225	225
RO	225	DA, LBB, LB, HLB, LC, HLC, LA-P	225	225
RO	300	DA, LBB, LB, HLB, LC, HLC, LA-P	400	400
RO	400	LA, HLA, LC, HLC, NB-P	400	400
RO	600	MA, HMA, MC, HMC, NB-P	600	600
RO	800	NB, HNB, NC, HMC, PB, PC, PB-P	800	...
RO	1000	PB, PC, PB-P	1200	...
PRO	1200	PB, PC, PB-P	1200	...
PRO	1400	PB, PC	2000	...
PRO	2000	PB, PC	2000	...

¬ Fuse ratings given are as allowed by C.E.C. If other ratings are desired, refer to C.E.C.

Table 3 — Maximum Upstream Circuit Protective Devices for Type A Robonics, 90% or Larger Motor Load

Robonic		Maximum Upstream	Maximum Upstream
			Fuse-Rating¬
Type Continuous		Breaker Frame Size	Class	Class
	Rating		J or L	K5 or R
	(amps)
LRO 30, 70, 100		EB, EHB, FB, HFB, FB-P	300	100
		LA-P c/w 400LAP10
RO	150,200,225	CA,CAH,JA,KA,HKA,LA,HLL,LB,	400	225
		HLB, MA, NB, HLC, MC, HMC, NC,
		HNC, LA-P, NB-P c/w 500 NAB12
RO	400	LB, HLB, LC, HLC, LA, HLA, LA-P	600	400
		MA,HMA,MC, HMC, NB, HNP, NC,
		MNC, NB-P
RO	600, 800	MA, HMA, MC, HMC, NB, MNB, NC,	1200	600
		MNC, NB-P
RO	1000	NB, HNB, NC, HNC, PB-P	1200	...
PRO 1200		NB,HNB,NC,HNC,PB-P	1200	...
PRO 1400, 2000		PB, PC, PB-P	2000	...

¬ Fuse ratings given are as allowed by C.E.C. If other ratings are desired, refer to C.E.C.

Logic Control
Voltage Sensing Modules
1Ø Undervoltage	S# 1266C79G04	Option#5C, 26B
3Ø Undervoltage	S# 1266C79G03	Option#5C, 26A

These cards are normally set at 70% dropout and 90% pickup.

1Ø Overvoltage	S# 1266C79G02	Option#5B, 26C
3Ø Overvoltage	S#12266C79G01	Option#5B, 26C

These cards are normally set at 105% pickup and 115% dropout. All styles are applicable to both emergency and normal source monitoring.

Frequency Sensing Modules
1Ø Underfrequency	S#1275C74G04	Option#5D, 26D
1Ø Overfrequency	S#1275C74G06	Option#5E, 26E