UL 489 Thermal-magnetic Circuit Breakers (TMC 8)

Phoenix Contact
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The TMC 8 series comprises 1-pole, 2-pole, and 3-pole thermal-magnetic miniature circuit breakers (MCBs) in accordance with UL 489 and EN 60947-2 for DIN rail-mounted applications.

These dual-rated breakers are equipped with toggle actuation, visual status indication and high-rated interrupting capacity and are meant to protect branch circuit conductors. A positively trip-free snap action mechanism ensures reliable switching behavior for use in switchgear, panel boards, and electrical equipment.

Phoenix Contact's TMC 8 breakers are rated at 120/240/277/480 V AC and 60/125 V DC with a 10 kA short circuit current rating.


  • Single-pole and multi-pole options
  • Visual status indication
  • Snap-action mechanism
  • Trip-free design
  • Cuttable auxiliary busbar
  • Range of trip curves (B, C, D)
  • High-rated interrupting capacity
  • International approvals for global use


  • Automation and Process Control
  • Chemical, Oil and Gas
  • Automotive Manufacturing
  • Renewable Energy
  • Pharmaceutical and Food
  • Telecom and Datacom
  • Lighting Equipment