Frequently Asked Questions For ABB Low Voltage Circuit Breakers

ABB 3/15/2018
Frequently Asked Questions For ABB Low Voltage Circuit BreakersQ: What is required to cross a Circuit Breaker?
A: 1. Current Rating and 2. Trip Curve (B, C, D, K, UC-K, Z, UC-Z, etc)

Q: What is the Difference between the S200 Series and the S500 Series Miniature Circuit breakers?
A: The S200 Series Circuit Breakers don't satify the UL requirement due to the Isolation Barriers for protection on a feeder circuit. The S200 Series Circuit Breakers are a less expensive means of current protection. The S500 series K type Circuit Breakers have adjustable current settings.

Q: What is the cross from an older S210 series breaker?
A: The S210 series went to the S280 series. These are being phased out, so the current version would be S200P series (Example: S212 » S282 » S202)

Q: How do I cross my Isomax circuit breaker to Tmax circuit breaker?
A: Follow these steps:
• Verify Interrupting Capacity.
• Verify circuit breaker amperage.
• Verify trip unit (thermal magnetic,electronic trip, magnetic only, etc.).
• Verify number of poles.
• Verify accessories.

Q: What is the minimum operating voltage for a Tmax with a thermal mangnetic trip unit?
A: Tmax breakers are available with thermal magnetic trip units from 15A to 800A. The minimum operating voltage is 24VDC.

Q: What is the difference in a straight voltage rating and a slash rating?
A: A circuit breaker with a straight voltage marking e.g. 480V or 600V, maybe applied in a circuit where the nominal voltage between any two conductors does not exceed the circuit breakers ratings. A circuit breaker with a slash rating e.g. 480Y/277V or 600Y/347V, may be applied in a circuit where the nominal voltage to ground from any conductor does not exceed the lower of the two values of the circuit breaker voltage rating, and the nominal voltage between any two conductors does not exceed the higher value of the circuit breaker's voltage rating.

Q: I cannot mount the ABB Flange Handle on my Hoffman box.
A: Hoffman enclosures with a universal cut out requires an adapter plate provided by Hoffman. As with all enclosure manufactures the customer should consult the enclosure manufacturer's catalog.

Q: I Need A Kirk Key, what does ABB Offer?
A: ABB does not sell a kirk key. We only sell the provisions for the kirk key on the E-Max breakers. We do Sell a Kirk Key lock adaptor plate.

Q: Can I get a ground alarm only with the Emax breaker?
A: Yes. When you use the PR122/P-LSIG or the PR123/P-LSIG it is possible to disable the trip control of the G protection function. Circuit breaker opening does not take place, only the alarm condition is signaled. For remote signaling of the alarm the electrical signaling module can be used.

Q: If I need an ammeter which Emax trip unit should I select?
A: An ammeter is standard on both the PR122/P and the PR123/P trip units.

Q: Can a GFCI circuit breaker be installed on the AC power feeding a drive, or will the drive cause it to trip?
A: The AC Drive most likely will cause the GFCI protection device to trip. The reason the AC Drive will cause this tripping of the GFCI is the Common Mode Current or Common Mode Noise (CM Noise) that the VFD is producing. The high rate that the IGBT is switched on and off is around (1 - 16 kHz). This switching creates Common Mode Electrical Noise. The Common Mode Noise is the current that appears on a conductor with respect to ground. This Common Mode Noise can and will travel throughout the plants ground system and even beyond. This Common Mode Noise can affect the operation of the application, and other equipment in the plant by interfering with signals from sensors, computers, PLC's, telephone and radio. The VFD does provide ground fault protection on the output of the drive.