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Circuit Protection /... > UL 489 Rated Molded ... > Triple Pole MCCBs, 1... > 250A-400A (400A K-Frame)

250A-400A (400A K-Frame)

3P series K-Frame molded case circuit breakers offer branch or feeder circuit protection against overload or short circuits. K-Frame 3-pole breakers, with adjustable thermal magnetic trip, are available in current capacities of 250 to 400A at 600VAC/250VDC (UL489 rating). Kits that include an aux contact, shunt trip or undervoltage release are also offered.

15A-100A (100A G-Frame)

60A-225A (225A F-Frame)

250A-400A (400A K-Frame)

400A-600A (600A L-Frame)

Spare Parts & Accessories

MCCB - Molded Case Circuit Breakers - 250 to 400 Amp K-Frame

3P Series K-Frame MCCBs

These 3 pole breakers are designed to provide branch and feeder circuit protection in industrial control panels. The 3P Series Molded Case Circuit Breakers provide overload protection in conductors and short circuit protection in connected equipment such as motors. Shunt trip breakers and other accessories are easily field installable for these frame size models.

K-Frame industrial circuit breakers are available as individual components or in a kit (with various accessories included)
Breaker frame includes 3-pole adjustable magnetic trip
Available accessories are field installable on this frame size
All K-Frame breakers are molded case circuit breakers with a thermal magnetic trip; line and load lug terminals are included
All circuit breakers include base mounting hardware for panel mount applications
Type C361 door interlocking safety handle kits

They are UL listed for installation in UL 508 control panels. Their small size, in relation to standard circuit breakers or other comparable devices, saves panel space.

K-Frame MCCB prices
start at $1,173.00

MCCB - Molded Case Circuit Breakers - 250 to 400 Amp K-Frame

3P Series K-Frame MCCBs

K-Frame MCCBs - Circuit Breaker Accessories

Accessories available for the K3P Series molded case circuit breakers include:

KHMVD12B - NEMA 1/12 rotary handle for K-Frame breakers. Position indicating; lock-off feature. Shaft length: 12”.
HM3R12X - NEMA 4/4X rotary handle for K-Frame breakers. Position indicating. Lock-off feature. Shaft length: 12".
HM3R24X - NEMA 4/4X rotary handle for K-Frame breakers. Position indicating. Lock-off feature. Shaft length: 24".
F3S03C - NEMA 1/12 flexible shaft handle for K-Frame breakers. Flange mounted. Lockable. Shaft length: 3'.
F3S06C - NEMA 1/12 flexible shaft handle for K-Frame breakers. Flange mounted. Lockable. Shaft length: 6'.
A1X3PK - Field installable auxiliary contact for K-Frame MCCBs.
SNT3P11K - Field installable 120/240 VAC shunt trip circuit breaker option for K-Frame MCCBs.
SNT3P04K - Field installable 12/24 VDC/VAC shunt trip circuit breaker option for K-Frame MCCBs.
UVH3LP08K - Field installable 120/240 VAC undervoltage release circuit breaker option for K-Frame MCCBs.
UVH3LP21K - Field installable 12/24 VDC/VAC undervoltage release circuit breaker option for K-Frame MCCBs.
3TA401K - Replacement lug kit for K-Frame MCCBs. Package of 3.
C361KJ4 - Type C361 door interlocking safety handle kit, 4" handle length.
C361KJ6 - Type C361 door interlocking safety handle kit, 6" handle length.
C361KR - Door Interlocking safety roller kit