Eaton MS Series Single-Phase M...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$35.83
Eaton MS Series Single-Phase Motor Starter Heater Element

Eaton MS Series Single-Phase Motor Starter Heater Element

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Model: MSH4-1A

In Stock (leaves warehouse same day if ordered before 3pm ET)

$35.83
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Eaton MS Series Single-Phase Motor Starter Heater Element

The Eaton MS Series Motor Starter Heater Element is a replacement heater engineered specifically for use with Eaton's MS Series single-phase motor starters. Sized to correspond with the connected motor's full load current, this heater element works together with the starter's overload relay assembly to deliver accurate, consistent thermal protection for single-phase motor circuits. Whether you are servicing an existing motor control panel or replacing a worn heater element in an MS Series starter, this component is built to restore proper overload sensing performance. Backed by Eaton's 1-year warranty, it is a dependable, code-conscious choice for electricians and maintenance teams maintaining single-phase motor starter installations.

Key Features

  • Starter Type: Purpose-built for use with Eaton MS Series single-phase motor starters, ensuring proper fit and function within the starter's overload relay assembly.
  • Motor Full Load Current Matching: Selected to correspond to the connected motor's full load current (FLA), which is essential for accurate thermal overload sensing and nuisance-trip-free operation.
  • Direct Replacement Element: Functions as a heater element for the MS Series overload relay assembly, supporting straightforward field replacement without reconfiguring the entire starter.
  • Reliable Overload Protection: Helps safeguard single-phase motor circuits from sustained overload conditions when correctly matched and paired with the appropriate MS Series starter.
  • Simplifies Maintenance: Allows maintenance teams to service and restore MS Series starters in the field rather than replacing the entire starter assembly, reducing downtime and cost.
  • Backed by Warranty: Covered by a 1-year Eaton warranty, giving installers and facility teams added confidence in continued, dependable service.

Technical Specifications

  • Warranty: 1 year
  • Series: MS

Typical Applications

  • Motor Control Panels and Motor Control Centers
  • Single-Phase Motor Overload Protection
  • MS Series Motor Starter Maintenance and Field Servicing
  • Replacement Heater Elements for Existing Starter Installations
  • Commercial and Industrial Electrical Systems
  • Facility and Plant Maintenance Programs

Why Eaton?

Eaton is a trusted name in motor control and protection equipment, and the MS Series Motor Starter Heater Element reflects that same commitment to dependable, code-compliant performance. Backed by a 1-year warranty and engineered to work seamlessly with MS Series single-phase starters, this heater element helps ensure accurate overload protection and continued reliability for professional electrical and industrial applications where consistent motor protection is essential.

Manufacturer Resources

Spec Sheet

Product Specs

Series:
MS
Product Type:
Motor Starter Heater
Department:
Electrical
Product Group:
Motor Control & Automation
Product Subgroup:
Motor Starters & Contactors

Eaton MSH4-1A – Frequently Asked Questions

1) How do I pick the right Eaton MS Series heater element for my motor?
Pick by the motor's full load current off the nameplate, then choose the heater whose FLA band brackets that number. The MS Series heaters are sold in banded increments, for example MSH-5A covers .40-.43A, MSH1-9A covers 1.52-1.67A, MSH4-5A covers 3.60-3.99A, and MSH12-9A covers 10.31-11.35A. If the motor FLA falls between two bands, you are in the wrong band and the relay will either trip on normal load or fail to sense a sustained overload.
2) Will an Eaton MSH heater element fit a three-phase starter?
No. These are heater elements for Eaton MS Series single-phase motor starters and their overload relay assembly. A three-phase starter uses a different overload block and different heaters, so ordering an MSH part for a three-phase panel gets you a component that does not belong in the relay.
3) Can I replace just the heater element instead of the whole motor starter?
That is exactly what the MSH element is for. It drops into the MS Series starter's overload relay assembly as a field replacement, so a maintenance tech can restore overload sensing without pulling and rewiring the starter. For a plant or facility crew, that is the difference between a short panel outage and a full starter swap.
4) What is the full amp range covered by Eaton MSH heater elements?
The MSH heaters span from .40A at the low end (MSH-5A) up to 16.00A at the top (MSH18-6A, covering 15.13-16.00A). Anything above 16A is outside what this heater family handles on a single-phase MS starter.
5) My motor nameplate reads 4.5 amps FLA. Which Eaton heater do I order?
MSH-55A, which covers 4.40-4.79A. Use the nameplate FLA for the actual applied voltage, not a rule-of-thumb amp figure, since the heater band is narrow enough that a guess can land you in the wrong part number.
6) What happens if I install a heater element sized above my motor's FLA?
An oversized heater lets the motor draw sustained current past its rating before the overload relay reacts, which is how windings cook. Undersized and you get nuisance tripping on normal starts. The MSH bands are deliberately tight, .88-.95A on MSH1-1A for instance, so the element senses at the motor's actual load point rather than somewhere near it.
7) Is the Eaton MSH heater element a fuse or a circuit breaker replacement?
Neither. It is the thermal sensing element inside the starter's overload relay, protecting the motor against sustained overload. It does not replace branch circuit short circuit and ground fault protection, so the fuses or breaker feeding the motor circuit still have to be there.
8) I am stocking spares for a plant with several MS starters. Do I need a different heater for each motor?
Yes, one per motor rating rather than one part number across the board. Heaters are matched to each motor's FLA, so a 1.4A motor takes MSH1-7A (1.36-1.51A) while an 8.9A motor takes MSH10-6A (8.47-9.35A). Build the spares list from a nameplate survey of the panel, not from starter model alone.
How fast can I get the Eaton MSH4-1A delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
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 MSH4-1A come with a warranty?
Absolutely. The Eaton MSH4-1A 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 MSH4-1A?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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