The complete family of UL Listed 489 circuit breakers (TMC 8 series) and UL 1077 supplemental protectors (TMC 7 series) from Phoenix Contact are ideal for a wide array of applications, from machine building and oil and gas to water/wastewater, energy, transportation, and telecom. With multi-pole options, our breakers can satisfy a variety of needs while safely protecting your equipment and systems from overcurrent disturbances.
Trip-free design
With safety a key priority, our innovative breakers incorporate this feature to open during an overcurrent event, even when the switch is held closed.
Snap-action mechanism
Everyone wants a product with an exceptional lifespan. This design inherently creates a longer-lasting product by eliminating contact welding and reducing contact wear and pitting.
Flexibility in innovation
The TMC 7 and TMC 8 series offer 1-, 2-, and 3-pole options, as well as B-, C-, and D-trip curve versions to ensure the proper trip speed based on your application. There are also a variety of accessories to further increase your system’s functionality including an auxiliary contact, alarm contact, and shunt trip. Our breakers can also be bussed together, utilizing our cuttable UL 508 Listed busbars.
TMC 7 Series products
1-, 2- and 3-pole circuit breaker
- UL 1077 Recognized
- 1-63 A
- Up to 277/480 V AC (125 V DC)
- 10 kA SCCR
- B-, C-, and D-trip curves
TMC 8 Series products
1-, 2- and 3-pole circuit breaker
- UL 489 Listed
- 1-63 A
- Up to 277/480 V AC (125 V DC)
- 10 kA interrupt rating
- B-, C-, and D-trip curves
Busbars
Multi-pole, cuttable busbars
- UL 508 Listed
- Cut-and-cap installation
- 80 A rating
Accessories
Aux contact
- Notification of breaker actuator
Alarm contact
- Overcurrent trip indication
- Not activated by manual operation of actuator
Shunt trip
- Allows remote trip
- Indicates if tripped remotely or via an overcurrent event
Lock-out/Tag-out (LOTO)
Compatible with TMC 7 & 8 thermal-magnetic circuit breakers
- Compliant with NEC 110.25
- 1, 2 and 3 pole options
- Provisions for 6 1/4 inch locks
Circuit breakers: UL Approvals and tripping technologies
Not all circuit breakers are rated the same and understanding the different UL approvals can be confusing. This article provides a quick overview of the different UL approvals and the four different types of circuit breaker tripping technologies.
Fundamentals of overcurrent protection
Overcurrent protection is selected based on the nominal voltage, nominal current, and, if required, the starting current of an end device. The expected error situation –short circuit or overload – then determines the appropriate shutdown behavior.