Circuit Breaker Type Combination Starters

For applications requiring a breaker-type combination starter, Square D provides both a thermal magnetic circuit breaker and a motor circuit protector.
The most widely used over-current protection devices are thermal-magnetic circuit breakers, which use bi-metals and electromagnets to provide both thermal and magnetic over-current protection. MAG-GARD™ motor circuit protectors are similar in construction but provide only short circuit protection. When MAG-GARD devices are used with motor starters, the adjustable instantaneous trip provides maximum motor protection based on specific amperage and application.

Type S combination starters using thermal magnetic breakers carry a UL listed short circuit withstand rating from 5,000 to 30,000 amperes. If a MAG-GARD Type GJL breaker is used, withstand ratings increase to 100,000 amperes. Specific ratings and listings may vary depending on the specific combination of components used in the assembly.

Features and benefits

• Handle Mechanism: Includes a color-coded knob for quick and easy ON/OFF; a mechanical interlock which inhibits opening of the door when the starter is energized OR inhibits energizing the starter when the door is open; and a lockout provision for additional safety when a padlock is used.
  
• Door Closing Mechanism: Supplied on NEMA 12 devices. Ensures door and enclosure integrity with an additional provision for padlocking.
  
• Solid Ground Bar: Included in all enclosed starters to meet the most stringent control and conduit grounding requirements.
  
• Wide variety of available enclosures.
  
• Modification kits and accessories are available