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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.

Highlights

  • 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

Specifications

BrandSQUARE 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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