Circuit Breakers Our extensive P&B circuit breaker product line includes thermal and magnetic types. Termed secondary breakers by UL, they protect equipment rather than branch circuits in buildings. One- to four-pole models are available in current ratings from milliamps through 50 amps.
All series in this product line meet the requirements of UL 1077, and recent enhancements allow several models to also meet ignition protection requirements according to UL 1500.
Thermal Circuit Breakers 
Due to their relatively low cost, thermal breakers are applied more broadly than magnetic breakers. Thermal applications include:
- Line Conditioning
- Treadmills
- HVAC (Transformer)
- Appliance (Range Hood)
- Cable TV Converters
- Spa Controls
- Uninterruptible Power Supplies
- RVs (HVAC system)
- Appliance (Range)
- Test and Measurement
- Pool Heaters
- Bowling Pin Spotters
- Copy Machines
- Vending Machines
- General Aviation Aircraft
- Medical Equipment
Magnetic Circuit Breakers
Applications that might require the precision of a magnetic breaker include:
- Medical/Dental Diagnostic Equipment
- Automation Robotics
- Welders
- Elevators
M9/W9 Series Standard Size Magnetic Circuit Breakers
(Approx. 0.75 x 2.5 x 2.1d [19 x 63.5 x 53.3d] per pole)
M6/W6 Series Compact Size Magnetic Circuit Breakers
(Approx. 0.75 x 2.0 x 1.64d [19 x 50.8 x 41.7d] per pole)
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