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UL489 Miniature Circuit Breakers

Uncompromising safety and comfort

UL489 miniature circuit breakers (MCBs) ensure electrical safety in multiple applications. UL489 MCBs feature two different tripping mechanisms, the delayed thermal tripping mechanism for overload protection, and the magnetic tripping mechanism for short circuit protection.

Features and benefits

  • Characteristics: C, K, and Z
  • Configurations: 1P, 1P+N, 2P, 3P, 3P+N, 4P
  • Breaking capacities up to 25 kA
  • Rated currents up to 63A
  • Real contact position indication, directly connected to the moving contact
  • Extra-wide and complete range of MCBs to cover most applications and markets
  • Compliance to worldwide product standards (IEC, UL, CSA)
  • Space and time saving thanks to the unique bottom-fixing auxiliary contact
  • Established and certified quality

Product range


  • Trip curve C, K, Z
  • Interrupting rating 10kA
  • 277/Y480 VAC max, 48/96 VDC
  • 0.2 to 63 A


  • Trip curve K
  • Interrupt rating 10 kA
  • 277/Y480 VAC max., 48/96 VDC
  • 0.2 to 63 A
  • Ring tongue terminals


  • Trip curves K, Z
  • 125/250 VDC for 1 to 40 A
  • 60/125 VDC for 50 to 63 A
  • Interrupt rating 14 kA


  • Trip curves C, K, Z
  • 277/Y480 VAC
  • 1 to 40 A
  • Interrupt rating 14 kA


  • Trip curves K, Z
  • 240 VAC
  • 10 to 100 A
  • Interrupt rating 30/50 kA (single pole/multipole)


Circuit protection characteristics of UL 489 Miniature Circuit Breakers

What you need to know about miniature circuit breaker trip curves