Eaton Three-Pole Thermal Overl...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$580.61
Eaton Three-Pole Thermal Overload Relay, NEMA Starter-Mounted, Class 20

Eaton Three-Pole Thermal Overload Relay, NEMA Starter-Mounted, Class 20

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Model: BA13A

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

$580.61
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Eaton Three-Pole Thermal Overload Relay, NEMA Starter-Mounted, Class 20

The Eaton Three-Pole Thermal Overload Relay is a NEMA-design, starter-mounted overload relay built for reliable motor protection in industrial and commercial control applications. Featuring a Thermal Type B, Class 20 trip mechanism and a full load current range of 19-135A, this relay is engineered as a direct replacement for Type A overload relays operating in manual reset mode (3-pole only). It is UL Listed for code-compliant installations and ships complete with a contactor mounting bracket, overload relay, and connection straps to the contactor.

Key Features

  • Three-Pole Configuration: Designed for three-pole motor circuits requiring balanced thermal overload protection.
  • Starter-Mounted Design: Mounts directly to the starter and includes a contactor mounting bracket, overload relay, and connection straps to the contactor for a complete replacement solution.
  • Full Load Current Range: Rated for 19-135A, covering a wide span of motor protection applications.
  • Trip Type: Thermal Type B, Class 20 trip characteristic for dependable overload response.
  • NEMA Design: Built to NEMA standards for use in North American industrial control systems.
  • Modification: Includes 1NC auxiliary contact and ambient-compensated construction for stable performance across varying temperatures.
  • Special Feature: Heaters required for operation, allowing current range matching to the specific motor application.
  • Compact Footprint: Measures 6 in wide x 8.2 in long/deep x 5.1 in high.

Certifications & Compliance

  • UL Listed
  • NEMA Design

Technical Specifications

  • Number of Poles: Three-pole
  • Product Width: 6 in
  • Product Length/Depth: 8.2 in
  • Product Height: 5.1 in
  • Type: A200
  • Mounting: Starter
  • Full Load Current Range: 19-135A
  • Trip Type: Thermal Type B, Class 20
  • Design: NEMA
  • Modification: 1NC Auxiliary Contact, Ambient Compensated
  • Special Features: Heaters required
  • Department: Electrical

Typical Applications

  • Motor Control Centers and Starter Panels
  • Three-Pole Motor Overload Protection
  • Replacement for Type A Overload Relays in Manual Reset Mode
  • Commercial and Industrial Electrical Installations
  • Retrofit and Renovation of Existing Motor Control Systems

Why Eaton?

Eaton's Three-Pole Thermal Overload Relay combines a NEMA-compliant, UL Listed design with an ambient-compensated build and Class 20 thermal trip response for dependable motor protection. With a complete starter-mounting kit and a broad 19-135A full load current range, it delivers a straightforward, code-compliant replacement path for Type A overload relay systems in professional electrical installations.

Manufacturer Resources

Product Specs

Department:
Electrical
Product Type:
Thermal Overload Relay
Amperage Rating:
19-135A
Listing:
UL Listed
Standards:
NEMA
Series:
A200
Product Group:
Wiring Devices
Product Subgroup:
Motor Starters & Contactors

Eaton BA13A – Frequently Asked Questions

1) Do I need to order heaters separately for the Eaton A200 thermal overload relay?
Yes. The Eaton three-pole thermal overload relay requires heaters to operate, and they are not part of the relay itself. The heater element is what sets the actual trip point within the 19-135A full load current range, so you size it to the motor's nameplate FLA. Order the relay and the matching heaters together or the starter will not protect anything.
2) Will this Eaton relay replace an existing Type A overload relay in my starter?
It is built as a direct replacement for Type A overload relays running in manual reset mode, three-pole only. If the unit you are pulling out is a Type A in automatic reset, or a two-pole arrangement, this is not a drop-in. The kit ships with the contactor mounting bracket, the relay, and the connection straps to the contactor, so the mechanical side of the swap is covered.
3) What does Class 20 mean on this overload relay, and when would I want Class 10 instead?
Class 20 means the relay will let the motor run at 600 percent of full load current for up to 20 seconds before tripping. That extra time suits motors with longer accelerating loads, fans, loaded conveyors, and high inertia starts. If your motor comes up to speed quickly or the manufacturer calls for tighter protection, a Class 10 device is the right pick, such as the ABB TF42-16 or the Square D TeSys K differential relay. Square D's TeSys Deca is also a Class 20 unit if you want a like-for-like trip class from another brand.
4) Is this a NEMA or IEC overload relay?
It is a NEMA-design device, built to NEMA standards for North American industrial control, and it mounts to the starter rather than to a DIN rail. If the drawing calls out an IEC starter, this is the wrong family. It is also UL Listed, which is what most inspectors and institutional specs want to see on motor branch circuit protection.
5) Which Eaton part number do I order for a Freedom NEMA starter versus an A200 starter?
The relay comes in five versions matched to the starter family: AA13A for Freedom NEMA, AA13AB, AN13P for A200, BA13A, and BA43A. Pick the one that matches the contactor line already in the panel, since the mounting bracket and connection straps are built for that starter.
6) My motor draws 42 amps full load. Does this Eaton overload relay cover it?
Yes, 42 A falls inside the 19-135A full load current range this relay covers. The relay body handles the span; the heater elements you order with it narrow that down to the actual trip point for a 42 A motor. Anything below 19 A or above 135 A needs a different frame size.
7) What is the closest Class 20 alternative to the Eaton A200 three-pole thermal overload relay?
If you need the same Class 20 trip characteristic from a different manufacturer, the Square D TeSys Deca Class 20 thermal overload relay carries that same trip class. The difference is the mounting approach: the Eaton A200 relay is a NEMA-design, starter-mounted unit that ships with a contactor mounting bracket and connection straps to the contactor, and it requires separately selected heaters to match the motor full load current within its 19-135A range. The TeSys Deca is an IEC-series device, so confirm your contactor family before treating it as a drop-in.
8) I need overload protection for a small motor well under 19A - what should I use instead of the Eaton A200 relay?
The Eaton A200 three-pole relay covers a 19-135A full load current range, so a fractional or small motor falls below it. The Square D TeSys K differential thermal overload relay is rated 3.7-5.5 A and is the kind of device sized for that end of the range. Check the motor nameplate FLA against the relay's adjustment band before ordering.
9) Can I swap an IEC overload relay into a NEMA starter in place of the Eaton A200 relay?
Treat that as a redesign, not a swap. The Eaton A200 relay is a NEMA-design unit that mounts to the starter and ships with a contactor mounting bracket and connection straps sized to the contactor, with heaters selected to match the motor. IEC-series devices such as the ABB TF42-16 or the Square D TeSys K and TeSys Deca relays are built to mount on their own contactor families, so the bracket, strap spacing and terminal arrangement will not line up with a NEMA starter. For a NEMA starter retrofit, stay with the NEMA relay.
10) How much room do I need in the enclosure for this Eaton overload relay?
Plan on 6 inches wide, 8.2 inches long/deep, and 5.1 inches high for the assembly. That is the relay with its contactor mounting bracket, so measure the panel space behind the starter as well as the width when you are fitting it into an existing motor control center bucket.
11) Does this Eaton overload relay have an auxiliary contact for the control circuit?
It includes a 1NC auxiliary contact, which is the normally closed contact you wire in series with the contactor coil so a trip drops the starter out. There is no normally open contact included, so if you need a separate trip indication or alarm signal you will have to take it from elsewhere in the control scheme.
12) Will this relay hold its trip point in a hot equipment room or an unheated space?
The Eaton A200 relay is ambient compensated, so the trip point stays stable as the surrounding air temperature swings. That matters when the starter sits in a hot mechanical room, a rooftop penthouse, or a plant floor where the panel temperature differs from where the motor actually runs. Without compensation, a bimetallic relay drifts and you get nuisance trips in summer and late trips in winter.
13) Can I use this Eaton overload relay on a single-phase motor?
No. This is a three-pole relay, built for balanced thermal protection across three motor circuit conductors. For single-phase work you need a device with the correct pole count, not this one.
14) Does this Eaton relay reset automatically after a trip?
It is supplied for manual reset operation, which is the configuration it replaces Type A relays in. Someone has to go to the starter and push the reset after a trip. That is usually what you want on motor loads where an unattended restart is a hazard, but if the sequence of operation calls for automatic reset, this is not the device for it.
15) How does a Class 10 overload relay differ from the Eaton Class 20 unit, and when would I pick one?
Trip class describes how long the relay tolerates locked-rotor current before tripping. The Eaton A200 three-pole relay uses a Thermal Type B, Class 20 trip characteristic, which allows a longer accelerating time and suits motors with higher-inertia loads. Class 10 devices such as the ABB TF42-16 or the Square D TeSys K trip sooner on the same overcurrent and are typically applied to motors that come up to speed quickly. Match the class to what the motor and the control drawing call for rather than substituting across classes.
16) My spec calls for phase-loss or differential tripping - does the Eaton A200 relay do that?
The Eaton A200 three-pole relay is a thermal, ambient-compensated design with a 1NC auxiliary contact and a Class 20 trip, protecting against sustained overload across three poles. If the drawing specifically calls out differential or phase-failure sensitivity, the Square D TeSys K differential thermal overload relay is the device built around that feature, at a 3.7-5.5 A rating. Confirm which behavior the engineer intends before substituting either way.
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Does the Eaton BA13A come with a warranty?
Absolutely. The Eaton BA13A is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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