We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Square D EDB two-pole miniature breaker, grey toggle, bolt-on lugs, compact industrial housing

SQUARE D

SQUARE D EDB24050 Miniature Circuit Breaker 50A 2 Pole

SKU CH-STJ3-9H2KM

A 50 A, 2-pole miniature circuit breaker rated 277/480 V AC and 125 V DC with 18 kA interrupting capacity for Square D NF panelboards

  • Reliable 18kA interrupting capacity at 277/480V AC
  • Protects two poles at 50A for balanced load control
  • Fits Square D NF panelboards with bolt-on mounting
  • Compact 5.66 x 1.96 x 4.05 in frame saves panel space
  • Operates safely up to 104°F ambient temperature

EDB Series 50 A Bolt-On Breaker

The Square D EDB24050 is a miniature circuit breaker rated at 50 A for 277/480 V AC single-phase panels. It mounts by bolt-on connection into Square D NF panelboards and load centres. The two-pole toggle actuator provides standard over-current protection for commercial and light-industrial branch circuits. Maximum operating temperature is 104 °F.

Replaces 125 A Frame Standard Breakers

This E-frame unit fits existing NF-series enclosures where a 125 A frame standard breaker is already specified. The 18 kA interrupting rating at 277/480 V AC matches the panelboard’s series rating, so the swap is worthwhile when the installed device has reached its service limit or when a new 50 A branch is added to a compatible bus.

Fits NF Panelboards With Lug Terminals

The breaker’s lug terminals accept the panelboard’s factory cables without adapters. Its 5.66 in length, 1.96 in width and 4.05 in depth align with the NF chassis, leaving adjacent pole spaces free for future circuits. The 125 V DC rating also permits limited DC control-circuit use where the panel schedule allows.

Highlights

  • Reliable 18kA interrupting capacity at 277/480V AC
  • Protects two poles at 50A for balanced load control
  • Fits Square D NF panelboards with bolt-on mounting
  • Compact 5.66 x 1.96 x 4.05 in frame saves panel space
  • Operates safely up to 104°F ambient temperature

Specifications

BrandSQUARE D

Questions about this item

Will the 5.66 in length and 1.96 in width fit my NF panelboard?

The breaker measures 5.66 in long, 1.96 in wide and 4.05 in deep, matching the bolt-on footprint used in Square D NF panelboards.

How do I bolt it onto the bus bar without cracking the lug?

Align the two poles with the NF panelboard bus, insert the mounting bolts through the breaker feet, and torque the lug screws to the panelboard manufacturer's specification — overtightening the terminal lug is the common error.

When should I replace the breaker after a fault at the 18 kA rating?

After any trip at or near the 18 kA AIR rating at 277/480 V AC, inspect the toggle and terminals for discoloration or damage; replace the unit if the actuator feels loose or the lugs show pitting.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.