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Grey rectangular three-pole breaker with toggle actuator and bolt-on lugs

SQUARE D

SQUARE D EDB34100 Circuit Breaker 100A 3 Pole E Frame 18kA 277/480V

SKU CH-X0S1-N78KX

Three-pole miniature circuit breaker rated 100 A at 277/480 V AC with 18 kA interrupting capacity for Square D NF panelboards

  • Protects three-phase circuits with 18 kA interrupting capacity at 277/480 V AC
  • Handles 100 A continuous current in a compact 125 A EDB frame
  • Mounts securely on NF panelboards using bolt-on lug terminals
  • Operates reliably up to 104 °F maximum ambient temperature
  • Fits tight spaces measuring 5.7 in long, 2.9 in wide, 4.1 in deep

EDB34100 100A Three-Pole Breaker

The SQUARE D EDB34100 is a bolt-on miniature circuit breaker rated at 100 A with three poles. It fits Square D NF panelboards and carries an EDB frame size of 125 A. The unit operates on 277/480 V AC or 125/250 V DC systems and uses a toggle actuator with lug terminals.

18 kA Interrupting Under Sustained Fault

The breaker delivers a maximum AIR rating of 18 kA at 277/480 V AC. This rating applies to short-circuit interruption rather than continuous overload, so the device remains closed during normal load cycles and opens only when fault current exceeds the trip curve. Maximum operating temperature is 104 Degrees F.

Bolt-On Mounting With NF Panelboards

Installation requires bolting the breaker directly onto a compatible Square D NF panelboard bus. The 5.7 in length, 2.9 in width and 4.1 in depth must match the panelboard cavity spacing. Misaligned lug connections or incorrect phase orientation are the most common wiring errors.

How it compares

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Price $557.99
Pricier than about 90% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSQUARE D

Questions about this item

How much heat does the 100 A breaker produce when running continuously at its 104 °F maximum operating temperature?

The breaker is rated for a maximum operating temperature of 104 °F; sustained loads near 100 A will bring the device close to that limit, so ensure the NF panelboard enclosure has adequate ventilation to keep internal temperatures below the rating.

Which Square D panelboard series must already be installed for the EDB34100 to bolt on correctly?

The breaker is designed for Square D NF panelboards and uses a bolt-on mounting style with lug terminals; it will not fit QO, Homeline or other series without an adapter that is not supplied.

Will the 18 kA interrupting rating coordinate with older 10 kA branch breakers already in the same NF panel?

The EDB34100 provides an 18 kA AIR rating at 277/480 V AC; when paired with 10 kA downstream breakers, selective coordination depends on the available fault current and time-current curves, not on the frame rating alone.

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