Aprilaire 4851 Blower Activation Relay

Blower Activation Relay

The blower activation relay is designed as a replacement/upgrade for the standard 3 pin relay on Aprilaire 4000 Series humidifiers. The relay is rated at 115VAC, 1A and uses a normally-open configuration, and includes two screw terminals.

Aprilaire 4851 Blower Activation Relay, 120~240 VAC, 50/60 Hz, 1.1 A Max., 3-Wire. 2 Pins.

Designed to protect blowers from damage caused by overloading, the Aprilaire Blower Activation Relay (also known as a blower shutdown relay) monitors blower performance and speed in order to protect your home from excess moisture buildup. The Aprilaire 4851 Blower Activation Relay is compatible with humidifiers featuring a 30-amp breaker.

The Aprilaire Blower Activation Relay replaces your current contact -less blower relay. The relay is the part that is most likely to fail on your system. Replace the worn out relay with one that can last up to 25 years, saving you time and money.

The Aprilaire 4851 blower activation relay is simple to install and easy to use. It requires no additional parts, and is compatible with any of the following systems: 420-100, 420-200, 420-300. The relay can be mounted on a standard DIN rail, using screws or double-sided tape provided by your installer, or otherwise attached to a structure inside the HVAC unit.

The Aprilaire 4851 Blower Activation Relay is a replacement blower activation relay that fits the Aprilaire 400, 500 and 600 Humidifier Models. It is part of the circuit that activates the blower when the humidifier's drain becomes clogged or inoperable.

Aprilaire's Relay Activates your Blower