ABB CR324CX Size 1 Solid State...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$741.84
ABB Size 1 Solid State Motor Overload Relay

ABB CR324CX Size 1 Solid State Motor Overload Relay

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Model: CR324CXHS

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

$741.84
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ABB CR324CX Size 1 Solid State Motor Overload Relay

The ABB CR324CX Size 1 Solid State Motor Overload Relay is engineered for reliable motor overload protection in industrial motor control applications. Built around a Size 1 NEMA-style overload configuration, this solid state relay is designed to safeguard connected motors from sustained overcurrent conditions that can lead to premature winding failure. This relay is available with a Motor FLA (full load amperage) sensing range spanning from 1.6-3.4A up to 13-27A, allowing facilities to select the FLA rating that matches the connected motor within the Size 1 starter platform. Each unit ships in a 1 EA package, making it a straightforward drop-in component for motor starter assemblies and control panels where dependable, code-conscious overload protection is required.

Key Features

  • Size 1 Configuration: Sized to match Size 1 motor starter and control applications for coordinated overload protection.
  • Motor FLA Range: Offered across Motor FLA settings from 1.6-3.4A through 13-27A, so the relay can be matched to the connected motor's full load current within the Size 1 platform.
  • Solid State Design: Solid state overload sensing offers consistent, repeatable trip performance without the mechanical wear associated with older bimetallic overload technology.
  • Motor Protection Function: Monitors motor current draw and interrupts control circuit power when sustained overload conditions are detected, helping prevent thermal damage to motor windings.
  • Compact Control Panel Fit: Designed to integrate with Size 1 motor starter assemblies commonly used in industrial motor control centers and control panels.
  • Single-Unit Packaging: Supplied 1 EA per package for straightforward stocking and replacement in maintenance and MRO applications.

Technical Specifications

  • Motor FLA Range: 1.6-3.4A to 13-27A
  • Overload Type: Solid State
  • Configuration: Size 1
  • Packaging: 1 EA

Typical Applications

  • Motor Control Centers and Starter Assemblies
  • Size 1 Motor Starter Overload Protection
  • Industrial Motor Circuit Protection
  • Panel-Mounted Motor Control Systems
  • Maintenance, Repair, and Replacement (MRO) of Motor Starters

Why ABB?

ABB is a recognized name in industrial motor control and electrical protection equipment, and this Size 1 Solid State Overload Relay reflects that focus with a solid state design intended for consistent, dependable overload sensing across its full Motor FLA range. For facilities and contractors standardizing on Size 1 motor starter platforms, this relay offers a straightforward path to reliable motor protection backed by ABB's motor control product line, with FLA options from 1.6-3.4A to 13-27A covering a wide span of connected motor sizes. Solid state overload sensing eliminates reliance on aging bimetallic strips, giving maintenance teams a more predictable, repeatable trip response across the Size 1 starter platform. Stocking this relay as a 1 EA replacement unit simplifies MRO planning for facilities that standardize on ABB Size 1 motor starter assemblies, keeping motor control centers and panel-mounted control systems ready for fast, code-conscious overload protection swaps whenever a unit reaches end of service life.

Manufacturer Resources

Product Specs

Product Type:
Overload Relay
Configuration:
Size 1
Country of Origin:
Unknown
Department:
Electrical
Product Group:
Wiring Devices
Amperage Rating:
1.6-3.4A - 13-27A
Product Subgroup:
Motor Starters & Contactors

ABB CR324CXHS – Frequently Asked Questions

1) Which ABB CR324CX overload relay do I pick for a 5 HP motor pulling about 15 amps?
Pick by motor full load amps. The ABB CR324CX Size 1 solid state overload relay comes in two current ranges: 1.6 to 3.4A (part CR324CXES) and 13 to 27A (part CR324CXHS). A motor drawing roughly 15A falls inside the 13-27A band, so CR324CXHS is the one to order. Read the FLA off the motor nameplate rather than converting from horsepower, since voltage and efficiency shift the actual draw.
2) Will an ABB CR324CX relay fit a Size 2 or Size 3 motor starter?
No. The CR324CX is built in the Size 1 NEMA overload configuration and is sized to match Size 1 starter and control assemblies. For a Size 2 or larger NEMA starter you need the overload block rated for that frame size, not this one.
3) What is the amp gap between the two ABB CR324CX ranges, and what if my motor is 6 amps?
The two ABB Size 1 solid state overloads cover 1.6 to 3.4A (CR324CXES) and 13 to 27A (CR324CXHS). A 6A motor falls between them, so neither of these two will protect it correctly. Too high a range will not trip in time to save the windings, and too low a range will nuisance trip. You would need the intermediate CR324C range block for that FLA.
4) Can I use a Square D TeSys overload relay instead of the ABB CR324CX?
Not as a direct swap. The CR324CX is a NEMA Size 1 block made to mount on ABB Size 1 starter assemblies. The Square D alternatives ZenSupply carries, the TeSys LRD electronic overload relay for 3-phase motor protection and the TeSys Deca Class 10A thermal overload relay rated 690V AC, are IEC-style relays that mount to their matching TeSys contactors. They are a valid choice when you are building a new IEC starter, but they will not bolt onto an ABB NEMA Size 1 starter.
5) What is the difference between the ABB CR324CX solid state overload relay and a Square D TeSys LRD electronic overload relay?
Both are electronic overload relays for motor protection, but they belong to different starter platforms. The ABB CR324CX is built in a Size 1 NEMA configuration intended to mount to Size 1 NEMA motor starter assemblies, and it is offered in current ranges including 1.6-3.4A and 13-27A motor FLA. The Square D LR9D is part of the TeSys LRD series, an IEC-style electronic overload relay for 3-phase motor protection that pairs with TeSys IEC contactors. If the panel is built on NEMA Size 1 starters, the ABB relay is the one that matches the mounting and sizing convention; if the panel is IEC-based, the TeSys electronic relay is the family to look at.
6) Is the ABB CR324CX solid state or bimetallic, and why does that matter for maintenance?
Solid state. The CR324CX senses overload electronically instead of relying on bimetallic strips, so trip performance stays consistent and repeatable without the mechanical wear that ages older bimetallic blocks. For a maintenance crew that means a more predictable trip response across a fleet of Size 1 starters, which is the main reason facilities standardize on it.
7) What does the ABB CR324CX actually do when a motor overloads?
It monitors motor current draw and interrupts control circuit power when a sustained overload is detected, which drops the starter coil and takes the motor off line before the windings cook. It is a protective device for the control circuit, not a short circuit interrupting device, so it works alongside the branch circuit breaker or fuses ahead of the starter.
8) Electronic or thermal overload relay, which should I spec for a motor starter?
Electronic sensing, like the ABB CR324CX solid state Size 1 or the Square D TeSys LRD, gives repeatable trip behaviour and no bimetallic strips to age out, which suits motors you cannot afford to lose and panels you want consistent across a site. A thermal block such as the Square D TeSys Deca Class 10A is the simpler, conventional choice for general purpose 3-phase loads on IEC contactors. The deciding factor is usually the starter you already have: NEMA Size 1 ABB starters take the CR324CX, TeSys contactors take the TeSys blocks.
9) We standardize our motor control centers on ABB Size 1 starters. Does the CR324CX work as a stock replacement unit?
That is the intended use. The CR324CX is a drop-in overload component for Size 1 motor starter assemblies and panel-mounted control systems, supplied one per package for straightforward stocking. Stock it by FLA range rather than by a single part number: the 1.6-3.4A CR324CXES and the 13-27A CR324CXHS are different blocks, so a shelf spare only covers the starters whose motor nameplate amps fall in that band.
10) Is a thermal overload relay a substitute for the ABB CR324CX solid state relay?
They protect the same way at a system level but sense differently. The ABB CR324CX uses solid state overload sensing, which gives repeatable trip response without the mechanical bimetallic element. A thermal unit such as the Square D LRD-05, a TeSys Deca Class 10A thermal overload relay rated to 690V AC, uses bimetallic sensing instead. It is also an IEC-style device, so it does not mount to a NEMA Size 1 starter the way the ABB relay does. Treat the thermal unit as a different technology on a different platform rather than a drop-in swap.
11) My motor draws about 20 amps full load - does the ABB Size 1 relay cover it, or do I need a different relay?
A 20A full load motor falls inside the CR324CXHS range, which covers 13-27A motor FLA on the ABB Size 1 solid state platform, so no alternate part is needed as long as the starter is NEMA Size 1. The smaller CR324CXES covers 1.6-3.4A and would not suit that motor. On an IEC panel the equivalent selection would be made within the Square D TeSys LRD electronic overload family for 3-phase motor protection.
12) We are standardizing a facility on one overload relay - what should we weigh between ABB CR324CX and the Square D TeSys options?
The deciding factor is the starter platform already installed. The ABB CR324CX is a Size 1 NEMA-configured relay for Size 1 motor starter assemblies and motor control centers, supplied one per package for MRO stocking, with solid state sensing across the range. The Square D alternatives are TeSys IEC-family devices: the LR9D electronic relay in the TeSys LRD series, and the LRD-05 thermal relay in the TeSys Deca series rated 690V AC. Facilities with NEMA-sized MCC buckets standardize on the ABB Size 1 relay; facilities with IEC contactor stacks standardize within TeSys.
13) How many relays come in an ABB CR324CX order?
One. Each CR324CX Size 1 solid state overload ships 1 EA per package, so a purchase order quantity equals the number of starters you are covering. That single-unit packaging is why it works as a shelf spare for MRO stocking rather than something you buy by the box.
How fast can I get the ABB CR324CXHS 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 ABB CR324CXHS come with a warranty?
Absolutely. The ABB CR324CXHS 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 ABB CR324CXHS?
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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