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Cooler PE2

The PE2 line of dual-fan air-to-liquid of power electronics and traction motor coolers delivers higher cooling capacity for power electronics, traction motors, and inverters.

Available with 24V DC fans or a 400V AC rail-certified version, PE2 models can be specified with integrated header tanks and CAN-enabled fan control. Proven globally, these coolers offer reliable performance and integration flexibility for bus, coach, off-highway, rail, and stationary power applications.

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Overview

The PE2 line delivers dual-fan air-to-liquid cooling for platforms requiring higher heat rejection, including a rail-certified 400V AC model. Coolant circulates through inverters, motors, and electronics before rejecting heat via Grayson’s high-quality tube-and-fin radiator with two integrated fans, keeping components within their safe operating range.

In addition to its standard off-the-shelf models, Grayson can configure or design bespoke PE2 solutions. Using real-world parameters (ambient conditions, coolant flow, heat rejection, and temperature targets), we calculate the most suitable cooling configuration and supply either a validated existing unit or a tailored new cooler built in-house.

Features

Our coolers are designed to maximise heat rejection, maintain durability, and integrate easily into vehicle systems.

  • Air-to-liquid cooling: Maintains coolant stability for critical powertrain components.
  • Dual-fan configuration: Delivers higher capacity cooling for medium-to-large heat loads.
  • 24V DC and 400V AC fans: Supports vehicle, stationary and rail-specific requirements.
  • Optional header tanks: Simplifies coolant system packaging and integration.
  • Smart CAN-enabled control: Fan regulation optimises thermal efficiency.
  • Global reliability: Trusted across bus, rail, off-highway, and stationary power.
Technical

Each technical component supports stable cooling output, helping ensure dependable performance under different operating conditions.

  • Fan configuration: 2-fan
  • Voltage options: 24V DC / 400V AC (rail-certified)
  • Options: Integrated header tank, CAN-enabled V3 controller
  • Design: Tube-and-fin air-to-liquid cooler
  • Applications: Power electronics, traction motors, inverters, stationary power
Model Variations

The cooler range is available in a variety of models to suit vehicle type, thermal demand, and installation layout.

  • CP-6717-000 – 2-fan system       
  • CP-6064-000 – 2-fan system with V3 controller 
  • GK-6508-600 – 2-fan system with integrated header tank (LH)
  • GK-6508-700 – 2-fan system with integrated header tank (RH)         
  • 1A-6803-0A00 – 2-fan system, 400VAC, rail specification       
Voltage Options

24V DC / 400V DC

Include rail-certified model for rail applications.
Fan Configuration

2-Fan Design

Higher cooling capacity for medium-to-large systems.
Air-to-Liquid Cooling

Tube-and-fin design

Transfers heat from coolant loop to airflow for reliable passive cooling.
Control Options

V3 Controller with CAN

Wide HV compatibility for integration across multiple BEV and FCEV platforms.
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Compatible Applications

Product Benefits​

Discover why on-highway, off-highway, rail and stationary power OEMs choose Grayson PE2 line of coolers to protect their application’s critical components’ temperatures.

Higher Cooling Capacity

Dual fans manage greater thermal loads.

Rail-Ready Design

400V AC model meets rail specifications.

Flexible Options

Controllers and header tanks available to suit needs.

Low-Maintenance Cooling

Reliable and proven tube-and-fin design.

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We work with you to determine the most suitable system for your thermal requirements, based on your ambient temperature limit, coolant flow rate (l/min), heat rejection (kW) and desired coolant temperature. Learn More

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Discover More About Grayson

For more than 40 years, Grayson Thermal Systems has provided advanced heating and cooling solutions to vehicle industries worldwide. Our experience and innovation ensure lasting efficiency and dependable performance.