Potterton Gold RL3 Isolation Relay

Larger electric heating jobs sometimes use more than one boiler, and the Potterton Gold RL3 Isolation Relay is the part that lets three boilers work together as a bank. Its job is to isolate the output supply for the pump when two or more boilers run together.

Where an RL3 relay fits in

You will meet it on bigger houses, small commercial buildings and properties where a single electric boiler is not enough. The boilers can be on a single phase supply, or spread across the phases of a three phase supply. The relay assembly is mounted on DIN rail in a plastic housing, so it sits tidily in an enclosure near the boilers.

Specification

• Brand: Potterton
• Range: Gold
• Maker code: 94970058
• Suitable for: Three Potterton Gold electric boilers in a bank, single or three phase supply

Common Questions

When would a house need three electric boilers?

Where one electric boiler cannot meet the heat load, such as a large house or a small commercial building. The boilers share the work and the RL3 keeps their pump supplies apart.

Can the boilers be on different phases?

The RL3 is made for banks on a single phase supply or spread across a three phase supply. The wiring must follow the Potterton diagram for the supply you have.

Is the RL3 a replacement for a boiler isolator?

No. It isolates the pump output only, so each boiler still needs its own means of switching off the power.

Points to note for Glasgow installers

The RL3 is not designed to switch the main power to the boilers, so it does not replace proper isolators. For a two-boiler bank, the RL2 is the right part, and for a single boiler sharing a supply with a shower, use the RL1. Installation is a mains and three phase electrical job for a qualified electrician, working to the Potterton wiring diagrams. Have the Potterton Gold RL3 Isolation Relay wired exactly as the diagram shows.

Find related parts under Potterton accessories.

It can be ordered online, or collected from Plumb Parts at 555 South Street, Glasgow G14 0QX. Times are Mon-Fri 8am-5pm and, at weekends, Sat-Sun 8am-1pm.