Thermostatic Fan Relay Painless 40A Crimp Switch

Description

Product Overview

The Painless thermostatic fan relay is engineered to provide dependable protection for automotive electric fans and associated wiring. Constructed with a durable painted exterior and a crimp-type connector, the unit features a single‑pole single‑throw (SPST) contact design made from high‑conductivity materials such as silver, gold, or copper. Rated for up to 40 amps continuous current and a maximum switching current of 40 amps, it complies with industry standards for fan relays and thermostatic switches. The relay operates electrically, drawing only 1.5 watts, and includes a threaded mounting system (3/8″‑18 NPT) for secure attachment to the engine block or intake manifold.

Usage

Designed for automotive applications, this relay is ideal for protecting cooling fans, preventing voltage spikes, and ensuring stable voltage delivery to critical components. Install the unit on the engine block or intake manifold using the provided NPT adapter, and connect the crimp terminals to the vehicle’s wire harness. Suitable for both street and performance vehicles, it maintains fan operation within a safe temperature range of 175°F (off) to 185°F (on), making it perfect for daily driving, racing, or off‑road use.

Why Choose Us

Painless Performance Products delivers a relay that combines robust construction with precise temperature control. Each unit undergoes rigorous testing to meet compliance standards, ensuring reliability under demanding conditions. The 40‑amp relay and 30‑amp circuit breaker provide layered protection, while the threaded design guarantees a leak‑free, vibration‑resistant installation. Backed by a strong customer rating of 4.5 stars from 28 reviews, this relay offers peace of mind for mechanics and DIY enthusiasts alike.

Key Features

• 40 amp continuous rating with 30 amp circuit breaker for dual protection
• Thermostatic operation: 185°F on / 175°F off for precise fan control
• Threaded 3/8″‑18 NPT mounting for secure engine block installation
• Crimp connector compatible with silver, gold, or copper contacts
• Compliant with industry standards for fan relays and thermostatic switches

FAQ

What type of connector does the relay use?

The relay uses a crimp‑type connector, allowing secure attachment to standard automotive wire gauges and ensuring reliable electrical contact.

Can this relay be used on both gasoline and diesel engines?

Yes, the relay’s temperature range and current rating make it suitable for cooling fan applications in both gasoline and diesel engines.

Is the relay waterproof?

The painted exterior provides resistance to moisture and corrosion, and the threaded NPT mounting creates a sealed connection when installed correctly.

What is the warranty period?

Painless Performance Products offers a one‑year limited warranty covering manufacturing defects.

How do I adjust the temperature settings?

The relay is preset to 185°F on and 175°F off; adjustments require replacing the unit with a different model calibrated to the desired temperatures.