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PART NUMBER · ICE O MATIC

Ice O Matic 9181010-27 Relay

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The 9181010-27 is a relay listed under the brand Ice O Matic. A relay is a small switch run by a low voltage coil to manage electrical circuits inside the equipment.

By the HVAC Fitter teamUpdated Oct 22, 2026

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In cooling systems, potential relays help control motor or compressor circuits during startup. When the motor reaches speed, the switch changes state to protect electrical components from damage.

Safety first. Turn off power at the breaker before opening the equipment panel. Test for power with a meter before you touch any wire or electrical terminal. Take a photo of every wire before you remove the old relay.

Specifications

FROM THE PART LISTINGS
  • Part number: 9181010-27
  • Brand: Ice O Matic
  • Part type: Relay
  • Amps: 35A
  • Height: 2.25 in / 5.72 cm
  • Length: 4.95 in / 12.57 cm
  • Voltage: 400VAC
  • Width: 2.9 in / 7.37 cm
MATCH THESE NUMBERS ON YOUR OLD RELAY
  • Coil volts: must be the same
  • Action: same contacts, like SPDT or DPDT
  • Amps or delay: same or higher rating, same delay

From the maker's and parts sellers' listings for this number. Compare them with the label on your old part.

What the Relay Does

A relay uses an internal coil to open or close electrical contacts. This allows a smaller control signal to switch a heavier electrical load safely.

A delay timer or potential relay helps protect equipment like compressors. It ensures that the electrical circuit connects and disconnects at the correct time during operation.

Understanding the 9181010-27 Specifications

Always check your old part to ensure the physical dimensions and electrical ratings match. The 9181010-27 relay carries the following specifications:

  • Voltage: 400VAC
  • Current rating: 35A
  • Height: 2.25 in / 5.72 cm
  • Length: 4.95 in / 12.57 cm
  • Width: 2.9 in / 7.37 cm

How to Confirm a Replacement Matches

When selecting a relay for replacement, the electrical ratings and contact style must match the original component.

Follow these general relay matching rules:

  • Coil volts: must be the same.
  • Action: same contacts, like SPDT or DPDT.
  • Amps or delay: same or higher rating, same delay.

Safe Removal and Installation Steps

Replacing a relay involves handling line-voltage wiring. Always take proper safety precautions to avoid electric shock.

  1. Shut off electrical power at the main breaker panel.
  2. Use a reliable meter to test and confirm that no power reaches the unit.
  3. Take a clear photo of every wire connection on the old relay.
  4. Disconnect the wires and remove the mounting screws holding the old relay in place.
  5. Mount the new relay in the same position.
  6. Move wires one at a time to the matching terminals on the new part, using your photo as a guide.
  7. Restore electrical power and observe the unit during startup.

Read your old part

  1. Turn off all power to the equipment before inspecting internal parts.
  2. Locate the identification label printed on the side or top of the relay body.
  3. Check that the part number on the label reads 9181010-27.
  4. Verify the voltage rating matches 400VAC and the current rating matches 35A.
  5. Compare physical dimensions to confirm the relay fits within your mounting bracket.

When to call a pro

Hire a licensed HVAC technician for any step you are not sure you can do safely. If you do not have the right tools to test for voltage, call a qualified professional to complete the repair.

Questions

What is the voltage rating on the Ice O Matic 9181010-27 relay?

The 9181010-27 relay has a voltage rating of 400VAC. Your replacement must match this electrical rating.

What amp rating does this relay have?

This relay is rated for 35A. Replacement relays must have the same or higher amp rating.

How big is the 9181010-27 relay?

The physical specs are a length of 4.95 in / 12.57 cm, a width of 2.9 in / 7.37 cm, and a height of 2.25 in / 5.72 cm.

Can I replace this relay without turning off power?

No, you must never work on live wiring. Turn off power at the breaker and test for power before touching any wires.

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