Circuit Protection

Internal Accessory Modifications
Only two internally mounted modifications - shunt trip, undervoltage release, auxiliary switch, alarm switch - may be mounted in EB through PB. Only one of these modifications may be mounted in FB, HFB magnetic only, 2-pole EB, EHB, FB and SELTRONICE breakers. None are available in 1-pole breakers except alarm switch in EB, EHB and HFB. Refer to Eaton for possible special combinations of the following modifications not in tabulations.

Shunt Trip
For tripping the breaker from a remote point. A solenoid device mounts within breaker case. Breaker trips when coil is energized. Shunt trips should not be used as circuit interlocks using maintained contact pilot devices. A cut-off switch breaks the circuit to the momentary rated coil when breaker opens. Available for control voltages up to 250 volts DC or 600 volts AC. Voltage and frequency must be specified. Standard leads extend 18 inches outside the breaker. Longer leads may be specified.

Undervoltage Release
For undervoltage protection. A solenoid device mounts within breaker case. Coil must be energized before closing breaker. Trips breaker when voltage drops below 35 to 70% of coil rating. Picks up and seals in at 85% of coil rating. For line voltages up to 250 volts DC or 600 volts AC. Externally mounted resistors are supplied for certain ratings. Standard leads extend 18 inches outside of breaker. Longer leads may be specified.

Alarm Switch
Alarm indication when breaker trips. Does not function with manual operation. Automatically resets when breaker is re-latched. Standard leads extend 18 inches outside of breaker. Longer leads may be specified.

Auxiliary Switch
For auxiliary control circuits. Miniature switches mount within breaker. Commonly used for remote indication of open or closed breaker and electrically interlocking component control circuits. "A" contacts are closed when breaker is closed. "B" contacts are open when breaker is closed. Standard leads extend 18 inches outside of breaker. Longer leads may be specified.

External Accessory Modifications

Extended Line Terminal Shields
Order separately when needed. Install for shielding the line side terminal connections.

Handle Locks:

• Non-Padlockable

For prevention of unintentional operation of breaker. Fits over breaker handle and may be removed.

• Padlockable

For prevention of unauthorized operation of breaker. Is non-removable once installed on the breaker. Meets Underwriters' Laboratories, Inc. and California Code requirements.
Note: All breakers are trip free and will trip with handle locks attached. Cannot be used when handle extension is used

Plug-in Adapter Kits
For rear connected applications such as switchboards. Facilitates ease of installation and front removal of breaker. Includes conductor for mounting on breaker, plug-in mounting blocks with matching conductor, rear studs and mounting hardware. Order two mounting blocks style number when line and load are required; order one mounting block style number when either line or load is required.

Rear Connected Studs
For complete stud assembly, order a stud and appropriate tube based on thickness of customer's mounting panel. A short stud must be assembled adjacent to a long stud to maintain clearances required by Underwriters' Laboratories, Inc. Two studs are required per pole. Refer to Dimension Sheet 29-171 for stud sizes and extensions behind breaker.

Motor Operators
Motor operators provide complete remote control by means of a pushbutton or similar pilot device. Positive switching action is accomplished by use of an operating arm engaging the breaker handle. The unit is energized momentarily to actuate the lever arm moving it to either the "ON" or "OFF" position. The control power is broken by an internal cutoff switch. Means for emergency manual operations is provided.