Circuit Protection Frequently Asked Questions
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Question:
How do I get my disconnect switch to close? I rotate the knob on my disconnect switch, but the main contacts do not close.
Answer
The SIRCO and Fuserbloc Series disconnect switches capable of three positions, ONLY when combined with a handle allowing the TEST feature. If the TEST feature is purchased, the disconnect switch has three positions/functions for the actuator as follows:
- T = Test - Only the auxiliary contact are closed (use for control circuit testing)
- 0 = Off - Both the auxiliary and main contacts are open
- 1 = On - Both the auxiliary and main contacts are closed
The sight window indicates the positioning of the actuator.
- From 0 to T is by CCW Rotation of the Actuator
- From 0 to 1 is by CW Rotation of the Actuator
Note: The force required for CW rotation is somewhat high. It may feel like the lever may break off, but keep turning until the "1" position indicator appears in the sight window. The Socomec Instruction Sheets may help
FAQ ID: 1122
Question:
Can you use single phase power with Cutler Hammer MCCB's?
Answer
Yes, you can use the two outside poles of the breaker for single phase power.
FAQ ID: 1320
Question:
Can you use the WMZ/WMS devices for DC circuit protection?
Answer
Yes, you may be able to use these for DC circuits.
- WMZS are rated for 48VDC (1 Pole) 125 VDC (2 Pole)
- The sizing will be based on the trip curves (B, C or D)
- The rules that apply to OCPD (over current protective devices) for supplementary protection apply.
FAQ ID: 1352
Question:
What is the watt loss spec for the F3P-150 breaker?
Answer
The F3P-150 breaker watt loss spec is 30 watts.
FAQ ID: 1407
Question:
Can you use the FAZ / FAZ-NA series devices for DC circuit protection?
Answer
Yes, you may be able to use these for DC circuits.
- FAZ and FAZ-NA units are rated for 48VDC (1 Pole) and 96 VDC maximum (2 poles in series)
- The sizing will be based on the trip curves (B, C or D)
- The rules that apply to OCPD (over current protective devices) for supplementary protection apply.
FAQ ID: 1534