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Eaton MARK 75 Type HLA Molded Case Circuit Breaker Trip Unit, 600V, 250A
The Eaton MARK 75 Type HLA Molded Case Circuit Breaker Trip Unit is engineered for installation into Eaton MARK 75 breaker frames, delivering dependable overcurrent protection for demanding industrial and commercial power systems. Rated 600V and 250A, this trip unit features a field-adjustable magnetic trip range of 1250-2500A, allowing precise calibration to match specific load and fault-current conditions. The unit is UL Listed, supporting code-compliant performance in critical electrical distribution equipment.
Key Features
- Voltage Rating: 600V for use in demanding industrial and commercial power distribution systems.
- Amperage Rating: 250A frame rating suited to heavy-duty circuit protection applications.
- Adjustable Magnetic Trip: 1250-2500A magnetic trip range enables field calibration to match specific load and fault-current requirements.
- Compact Dimensions: 5.4 in width x 5.4 in height x 8.7 in depth for straightforward integration into existing MARK 75 breaker frames.
- Type HLA Trip Unit: Purpose-built for the MARK 75 molded case circuit breaker platform, supporting renewal and life-extension programs.
- UL Listed: Certified for reliable, code-compliant overcurrent protection.
Certifications & Compliance
- UL Listed
Technical Specifications
- Product Type: Circuit Breaker
- Product Width: 5.4 in
- Product Height: 5.4 in
- Product Length/Depth: 8.7 in
- Certifications: UL Listed
- Warranty: Eaton Selling Policy 25-000, one (1) year from the date of installation of the Product or eighteen (18) months from the date of shipment of the Product, whichever occurs first.
Typical Applications
- Industrial Motor Control Centers
- Commercial Switchgear and Panelboards
- Circuit Breaker Renewal and Life-Extension Projects
- Overcurrent Protection for Heavy Industrial Loads
- Retrofit and Replacement in Legacy MARK 75 Breaker Systems
Why Eaton?
Eaton engineers the MARK 75 Type HLA trip unit to precise voltage and amperage specifications, backed by UL Listing and Eaton's Selling Policy 25-000 warranty. This makes it a dependable choice for maintaining code-compliant overcurrent protection in critical electrical distribution equipment.
Manufacturer Resources
Product Specs
- Product Width:
- 5.4 in
- Product Height:
- 5.4 in
- Product Length/Depth:
- 8.7 in
- Certifications:
- UL Listed
- Product Type:
- Circuit Breaker
- Department:
- Electrical
- Voltage Rating:
- 600V
- Amperage Rating:
- 250A
- Series:
- MARK 75
- Listing:
- UL Listed
- Product Group:
- Circuit Breakers
Eaton HLA3250T – Frequently Asked Questions
1) Is the Eaton HLA3250T a complete circuit breaker or just the trip unit?
It's a trip unit only, not a complete breaker. The HLA3250T is built to install into an Eaton MARK 75 molded case breaker frame, so you need the existing frame in place. That's why it shows up most often on renewal and life-extension work rather than new gear builds.
2) What voltage and amperage is the Eaton MARK 75 Type HLA trip unit rated for?
600V and 250A. That 250A is the frame rating, which sets the ceiling for continuous load on the circuit it protects, and the 600V rating covers the usual 480V and 600V three-phase industrial and commercial distribution systems.
3) Can the magnetic trip setting on the HLA trip unit be adjusted in the field?
Yes. The magnetic trip is field adjustable from 1250A to 2500A, so an electrician can set the instantaneous pickup to match the actual load inrush and available fault current instead of living with a fixed factory point. On motor loads that's the difference between riding through starting inrush and nuisance tripping.
4) We have legacy MARK 75 breakers in our plant switchgear. Is replacing the trip unit an alternative to replacing the whole breaker?
That is exactly what this part is for. Rather than pulling and replacing an entire MARK 75 molded case breaker, the Type HLA trip unit drops into the existing frame to restore rated overcurrent protection. Common on circuit breaker renewal projects in industrial motor control centers and commercial switchgear where the frames and bus are still sound.
5) Will the HLA3250T fit in my existing enclosure? What are its dimensions?
The MARK 75 Type HLA trip unit measures 5.4 in width by 5.4 in height by 8.7 in depth. The 8.7 in depth is the number to check against your cubicle or panel depth before ordering.
6) Is the Eaton MARK 75 HLA trip unit UL Listed?
Yes, the Type HLA trip unit is UL Listed, which is what most facility and institutional inspectors want to see on overcurrent protection in switchgear, panelboards, and motor control centers.
How fast can I get the Eaton HLA3250T 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 Eaton HLA3250T come with a warranty?
Absolutely. The Eaton HLA3250T 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 Eaton HLA3250T?
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