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Manufacturer Resources
Spec Sheet
Product Specs
- Amperage Rating:
- 400A
- Catalog Notes:
- For DC applications, actual trip levels are approximately 40% higher than values shown. Comes with aluminum body terminals (3TA400K). Motor FLA ranges are typical. The corresponding trip setting is at 13 times the minimum FLA value shown.
- Compliances:
- Contact Manufacturer
- Frame Size:
- Frame J-K
- Magnetic Trip Range:
- 625-1250 A
- Number Of Poles:
- Two-pole
- Product Height:
- 2.5 IN
- Product Length Depth:
- 8.5 IN
- Product Weight:
- .25 LB
- Product Width:
- 2.6 IN
- Series:
- Series C
- Department:
- Electrical
- Product Type:
- Motor circuit protector
- Product Details:
- Motor circuit protector
B-LINE HM2P400F5 – Frequently Asked Questions
1) What is the magnetic trip adjustment range on the Eaton HM2P400F5 motor circuit protector?
The HM2P400F5 is adjustable from 625 to 1250 amps magnetic trip, on a 400A rating. Because a motor circuit protector trips instantaneously rather than on a thermal curve, that range is what you dial to clear motor inrush without nuisance tripping. Per the manufacturer's notes, the corresponding trip setting sits at 13 times the minimum FLA value shown, and the published motor FLA ranges are typical rather than absolute.
2) Will this HM2P400F5 fit a J or K frame Eaton breaker enclosure?
Yes. The HM2P400F5 is a Frame J-K unit in Eaton's Series C molded case line, so it is sized for J and K frame applications, not F or L frame. If your starter or panel is prepped for a different frame class, this is not the right part.
3) Is the HM2P400F5 a two-pole or three-pole motor circuit protector?
Two-pole. That makes it suited to single-phase motor branch circuits; a three-phase motor needs a three-pole device instead, so check the pole count on your drawing before ordering this one.
4) Do I need to order lugs separately for this 400A motor circuit protector?
No. The HM2P400F5 ships with aluminum body terminals, Eaton part 3TA400K, so the line and load terminations come with the device. That covers aluminum or copper conductors landed in a body terminal; if your spec calls for a different termination style, that would be a separate accessory.
5) Can I use the HM2P400F5 on a DC circuit?
It can be applied on DC, but the trip points shift. Eaton notes that on DC applications actual trip levels run roughly 40 percent higher than the published values, so the 625-1250 A magnetic range behaves higher in practice. Size the setting with that 40 percent offset in mind rather than reading the AC numbers straight off the dial.
6) What is the difference between a motor circuit protector like this and a standard thermal-magnetic breaker?
A motor circuit protector such as the HM2P400F5 provides instantaneous magnetic short circuit protection only, with the trip point adjustable from 625 to 1250 A. Overload protection comes from the overload relay in the motor starter, not from the protector. A standard thermal-magnetic molded case breaker combines both functions in one device. So if you are feeding a motor through a starter with its own overload element, an MCP is the correct choice; if there is no overload relay in the circuit, you want a thermal-magnetic breaker instead.
7) What exact part number should I put on the purchase order for this Eaton 400A MCP?
Order it as HM2P400F5. That is the Eaton catalog number for the 400A, two-pole, Frame J-K Series C motor circuit protector with the 625-1250 A adjustable magnetic trip.
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Does the B-LINE HM2P400F5 come with a warranty?
Absolutely. The B-LINE HM2P400F5 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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