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SQUARE D JJL36250M75 molded case circuit breaker three pole gray enclosure

SQUARE D

SQUARE D JJL36250M75 circuit breaker 250A 3-pole

SKU CH-11CW-Q1Z1W

Three-pole molded case circuit breaker rated 250 A with thermal-magnetic trip and 100 kA interrupting capacity at 240 V AC

  • 250 A motor-circuit protection for heavy-duty loads
  • 100 kA interrupting rating at 240 V AC for reliable fault clearing
  • Thermal-magnetic trip unit with adjustable 684–500 A settings
  • Three-pole 600 V AC / 250 V DC rated for versatile power distribution
  • Compact 7.52 in frame fits standard panel layouts

What this circuit breaker does

The SQUARE D JJL36250M75 is a moulded-case motor circuit protector rated at 250 A and 600 V AC with a 100 kA interrupting rating at 240 V AC. It uses a thermal-magnetic instantaneous trip unit and is built on the 250 A JJ frame for three-phase industrial power distribution.

What to verify before ordering

Confirm the panel accepts a free-standing mounting style and that line and load lug terminals suit your conductor size. The fixed low trip point is 684 A and the high trip point is 500 A, so the motor inrush current must fall within that window. Ensure the system voltage does not exceed 600 V AC or 250 V DC and that three-pole ABC phasing matches your busbar arrangement.

Heat, noise and power draw

As a passive protection device the breaker generates negligible acoustic noise and its own heat dissipation is minimal during normal operation. The thermal-magnetic mechanism trips instantly on short-circuit currents up to 100 kA at 240 V AC without requiring an external power source. Mount the unit with adequate ventilation space around the 7.52 in height to maintain rated performance.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

Price $2,037.99
Pricier than about 94% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSQUARE D

Questions about this item

Does the JJL36250M75 come with line and load lugs or must they be ordered separately?

The breaker includes line/load lug terminals as its standard connection method, so no separate lug kit is required for typical installation.

Should I select the 250 A frame with 2,500 A high trip and 684 A low trip, or is another trip curve available for this frame?

This model is a motor circuit protector with fixed instantaneous trip; the high setting is 2,500 A and the low setting is 684 A, and no alternative trip curves are offered for the 250 A JJ frame.

What does the 100 kA interrupting rating at 240 V AC mean for a real 600 V AC panel?

At 240 V AC the breaker can safely interrupt up to 100 kA; at the rated 600 V AC the interrupting capacity will be lower, so verify the panel’s available fault current against the breaker’s 600 V rating before applying it.

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