Eaton NEMA Freedom Three-Pole ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$239.27
Eaton NEMA Freedom Three-Pole Thermal Overload Relay, Panel Mounted

Eaton NEMA Freedom Three-Pole Thermal Overload Relay, Panel Mounted

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Model: C306DN3B

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

$239.27
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Eaton Freedom NEMA Overload Relay, Three-Pole, Panel Mounted

The Eaton Freedom NEMA overload relay is a three-pole, panel-mounted device engineered to protect three-phase motor circuits from sustained overload conditions. Built on Eaton's Freedom NEMA platform with dual NEMA and IEC design compatibility, this relay uses a thermal trip mechanism to sense excess current draw and interrupt the circuit before motor windings are damaged. It is available in a range of amperage ratings and requires heaters (sold separately, matched to actual motor full-load amperage) to deliver accurate thermal protection. Designed for integration into industrial control panels and motor starter assemblies, this overload relay supports reliable, code-compliant motor circuit protection for commercial and industrial applications.

Key Features

  • Amperage Options: Available in multiple amperage ratings for light-duty through heavy-duty three-phase motor overload protection.
  • Three-Pole Configuration: Three-pole design matches standard three-phase motor circuits for balanced overload sensing on all legs.
  • Panel Mounted: Panel mounting simplifies integration into motor control centers and industrial control panel assemblies.
  • Thermal Trip Mechanism: Thermal trip type provides dependable, temperature-based overload detection to help prevent motor burnout.
  • NEMA and IEC Design: Dual NEMA, IEC design standard supports flexible specification across both NEMA-style and IEC-style motor control systems.
  • Heaters Required: Special feature note confirms heaters are required and must be selected to match actual motor load for correct thermal response.
  • Freedom NEMA Platform: Part of Eaton's established Freedom NEMA line of motor control and protection components.

Technical Specifications

  • Number Of Poles: Three-pole
  • Type: Freedom NEMA
  • Mounting: Panel
  • Trip Type: Thermal
  • Design: NEMA, IEC
  • Special Features: Heaters required
  • Product Type: Overload Relay

Typical Applications

  • Three-Phase Motor Overload Protection
  • Industrial Motor Control Panels
  • NEMA and IEC Motor Starter Assemblies
  • Panel-Mounted Control System Integration
  • Commercial and Industrial Electrical Installations

Why Eaton?

Eaton's Freedom NEMA overload relays combine thermal trip protection with dual NEMA and IEC design flexibility, giving electrical professionals a dependable option for three-phase motor circuit protection. The three-pole, panel-mounted construction is built for straightforward integration into motor control panels, while the heater-based thermal sensing approach allows precise matching to actual motor load. Choose Eaton for motor control and protection components built for reliable, code-compliant industrial performance.

Variant Specifications

AmperageModelFrameSKU
20-39AC306DN3BStandardC306DN3B
Multiple (C306NN3 / C306KN3 / C306GN3B)StandardNEMA Size 1, 2, IEC Size G-KC306GN3B
Multiple (C306NN3 / C306KN3 / C306GN3B)StandardNEMA Size 3, IEC Size L-MC306KN3
Multiple (C306NN3 / C306KN3 / C306GN3B)StandardNEMA Size 4, IEC Size NC306NN3

Manufacturer Resources

Product Specs

Special features:
Heaters required
Department:
Electrical
Number Of Poles:
Three-pole
Product Type:
Overload Relay
Trip Type:
Thermal
Product Design:
NEMA, IEC
Product Group:
Relays

Eaton C306DN3B – Frequently Asked Questions

1) Does the Eaton Freedom C306 overload relay come with heaters, or do I have to order them separately?
Heaters are not included. The Freedom NEMA C306 thermal overload relay requires heater packs, and they have to be selected to match the actual full-load amperage of the motor you are protecting. Order the relay body and the matching heaters together, otherwise the relay is on the panel with no thermal element to sense current.
2) Which Eaton C306 overload relay matches a NEMA Size 3 starter?
Use the C306KN3. The frame options break down by starter size: C306GN3B covers NEMA Size 1 and 2 (IEC sizes G-K), C306KN3 covers NEMA Size 3 (IEC L-M), and C306NN3 covers NEMA Size 4 (IEC size N). Pick the relay by the size of the contactor or starter it is going onto, then add heaters for the motor's actual amps.
3) Is a three-pole overload relay right for a single-phase motor?
No. The C306 is a three-pole device, meant to sense current on all three legs of a three-phase motor circuit. For single-phase loads you want a single- or two-pole overload arrangement instead. Using a three-pole relay on single-phase leaves a pole unused and does not give you the balanced sensing it was designed for.
4) Will this Eaton relay work in an IEC-style motor control panel, or is it NEMA only?
Both. The Freedom C306 relay is built to a dual NEMA and IEC design, and the frame selections are published in both scales, so it drops into NEMA starter assemblies and IEC-size applications alike (for example the C306GN3B covers NEMA Size 1-2 and IEC sizes G through K).
5) Is the C306 a thermal or an electronic overload relay?
Thermal. Trip is temperature-based: the heater element warms with current draw and trips the relay on a sustained overload before the motor windings cook. That gives you an inverse-time response that tolerates normal motor inrush, rather than the current-transformer sensing and adjustable dials of an electronic overload.
6) Which C306 model covers a 20 to 39 amp range?
That is the C306DN3B, the standard-frame option published with a 20-39A rating. The larger frames (C306GN3B, C306KN3, C306NN3) are selected by NEMA or IEC starter size instead, with the heater pack setting the actual trip current in every case.
7) I am standardizing motor starters across a plant. Can one C306 relay family cover everything from small pumps to large air handlers?
Yes, within the four frames offered. The C306 line spans NEMA Size 1 and 2 (C306GN3B), Size 3 (C306KN3), and Size 4 (C306NN3), plus a standard 20-39A frame (C306DN3B). You standardize on the relay body per starter size and then stock heater packs by motor FLA, which keeps the spare-parts list short across a facility.
8) How does the Eaton C306 overload relay mount?
Panel mounting. It is intended to be fastened inside an industrial control panel or motor control center, typically on or beside the contactor it protects, rather than clipped to a DIN rail as a standalone device.
How fast can I get the Eaton C306DN3B 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 C306DN3B come with a warranty?
Absolutely. The Eaton C306DN3B 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 C306DN3B?
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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