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Manufacturer Resources
Spec Sheet
Product Specs
- Amperage Rating:
- 100A
- Circuit Breaker Frame Type:
- Complete breaker
- Circuit Breaker Type:
- FDB
- Frame:
- F-frame
- Frequency Rating:
- 50/60 Hz
- Interrupt Rating:
- 18 kAIC at 240 Vac, 14 kAIC at 480 Vac
- Number Of Poles:
- Three-pole
- Series:
- Series C
- Terminals:
- Load side
- Trip Type:
- Fixed thermal, fixed magnetic
- Undervoltage Release:
- 110-127 Vac rear with right pigtail
- Voltage Rating:
- 600 Vac, 250 Vdc
- Department:
- Electrical
- Product Length:
- 3.38 IN
- Product Height:
- 6 IN
- Product Weight:
- 4.5 LB
- Product Width:
- 4.13 IN
B-LINE FDB3100U62 – Frequently Asked Questions
1) Will the FDB3100U62 breaker hold up on a 480V panel, or is it only good for 240V?
The FDB3100U62 is rated 600 Vac and 250 Vdc, so a 480V system is within its voltage rating. What changes with voltage is the interrupting capacity: 18 kAIC at 240 Vac and 14 kAIC at 480 Vac. If your available fault current at the panel exceeds 14 kA on a 480V service, this F-frame breaker is not the right choice and you need a higher AIC frame.
2) Is the Eaton FDB3100U62 a three-phase 100 amp breaker?
Three-pole, 100A, which is what you use on a three-phase feeder or a three-phase motor circuit. It is an FDB-type F-frame breaker in Eaton's Series C line, rated 50/60 Hz.
3) Does the FDB3100U62 come as a complete breaker or do I have to add a trip unit?
It ships as a complete molded case breaker. The trip is fixed thermal and fixed magnetic, meaning there are no adjustable trip settings and no separate rating plug to order. You pick the breaker by its amp rating, 100A here, and that is the trip.
4) What does the U62 suffix on the FDB3100 mean?
On the FDB3100U62 the suffix covers a factory-installed undervoltage release rated 110-127 Vac, mounted at the rear with a right-hand pigtail. The UVR drops the breaker open when control voltage is lost, which is how these get used for emergency-stop and shunt-of-power schemes. If you do not need that accessory, a plain FDB3100 without the suffix is the breaker to look for.
5) Can I wire the undervoltage release on this Eaton breaker to a 24V control circuit?
No. The undervoltage release on this unit is a 110-127 Vac coil. A 24V control circuit will not hold it in, so you either need a 120V control source or a breaker ordered with a different UVR voltage. The coil leads come out the rear on a right-hand pigtail, so leave room behind the breaker for the wire run.
6) Will the FDB3100U62 fit the space I have in my enclosure?
The breaker measures 6 in, 4.13 in and 3.38 in (height, width, length as published) and weighs 4.5 lb. Account for the rear-exit undervoltage release pigtail when you figure gutter space behind the unit, since the leads add depth beyond the breaker body.
7) Does the FDB3100U62 include lugs on both line and load ends?
Terminals are specified on the load side. Plan your line-side connection accordingly, whether that is a panel bus stab arrangement or separately ordered line terminals for your installation.
8) Can I use this 100A breaker on a DC circuit?
It carries a 250 Vdc rating alongside 600 Vac, so DC use up to 250 volts is within rating. Bear in mind the published interrupting ratings, 18 kAIC and 14 kAIC, are given at AC voltages, so a DC application needs its own fault-current check against the manufacturer's DC data.
9) Where do I find the full technical data for the Eaton FDB3100U62?
Eaton publishes a spec sheet for the FDB3100U62, and it is linked directly from the product information. The core numbers you will need when sizing are the 100A rating, three poles, 600 Vac / 250 Vdc, and 18 kAIC at 240 Vac.
How fast can I get the B-LINE FDB3100U62 delivered?
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the B-LINE FDB3100U62 come with a warranty?
Absolutely. The B-LINE FDB3100U62 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the B-LINE FDB3100U62?
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