43WL Circuit Breaker Selection and Application Guide
1
Do not apply switch or breaker rated at 635VAC to a system with fault current > 85kA RMS.
2
Interrupt rating is 200kA based on fuse rating.
WL Power Circuit Breaker
Ratings for UL 1066 Listed (ANSI C37) Breakers
1
Ratings for UL 1066 Listed Non-automatic Switches
WL frame ratings Frame size 2 Frame size 3
800 - 2000A 3200 - 5000A
Rating Class F L F L
Breaking capacity with external relay (kA RMS) 254VAC 20 100 40 100
50/60 Hz, instantaneous trip 508VAC 20 100 40 100
635VAC 20 85 40 85
Short-time current Icw (kA RMS) 1 sec. 20 65 40 100
WL frame ratings – Frame size 3 3200A 4000A 5000A
Rating Class M F H L M F H L M F
Interrupting current frame Ics 254VAC 150 200 85 100 150 200 85 100 150 200
(kAIR RMS) 50/60 Hz 508VAC 150 200 85 100 150 200 85 100 150 200
600VAC — 200 — — — 200 — — — 200
635VAC 85 — 85 85 85 — 85 85 85 —
Short-time current Icw (kA RMS) 1 sec. 100 — 85 100 100 — 85 100 100 —
Close and latch rating (kA RMS) 100 — 85 100 100 — 85 100 100 —
Applicable rating plug range 800 - 3200A 800 - 4000A 800 - 5000 A
Mechanical make-time (ms) 35 35 35
Mechanical break-time (ms) 34 34 24
Electric close make-time (ms) 50 50 50
Electric trip/ UV break-time (ms) 40/73 40/73 40/73
Electric trip and reclose interval (ms) 80 80 80
Mechanical duty cycles (no maint.) 10,000 10,000 10,000
Electrical duty cycles (no maint) 10,000 10,000 10,000
Draw-out breaker efficiency (Watts loss at rated I
n) 700 1100 1650
Draw-out fused breaker efficiency (Watts loss at rated I
n) Consult factory Consult factory Consult Factory
Ambient operating temperature (ºC) -25 to 40 -25 to 40 -25 to 40
Weights (Fused Carriage/Breaker/Cradle) lbs. 225/260/306 225/260/306 225/260/306
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Courtesy of NationalSwitchgear.com
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