Relay Interfaces

Relay interfaces are devices for housing relays. They're a convenient way to organise and operate relays and they can also improve relay performance.

Every relay contains contacts, which are pieces of electrically conductive material, usually metal. When a pair of contacts touch, they pass an electrical current, making the switch ’closed'. When the contacts separate, the switch is ’open' and the current stops flowing. As well as housing relays, relay interfaces can be used to operate a relay's contacts.

How do relay interfaces work?

Relay interfaces can be convenient ways to operate relays. Relays are inserted into the slot or slots in the interface and they stay snugly mounted there until they're ejected. The relay interfaces commonly contain switches that make the contacts in each relay ’closed’ (on) or ’open’ (off).

Relay interfaces can also contain protection circuits that expand the range of relay input voltage.

Types of relay interfaces

Each relay interfaces is compatible with a specific relay, or several different relays. The relays may be stacked pyramidally or slotted in side by side. Relay interfaces also differentiated by their voltages, which can be AC, DC or AC/DC.


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RS Stock No. 410-8035
Mfr. Part No.2296058
HK$472.04
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- - PLC-V8/D15S/OUT 24V dc 3A
RS Stock No. 827-7182
Mfr. Part No.ZBRA1
HK$1,250.36
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Relay Antenna XB4R 22 mm (Dia) Control Unit, XB5R - 24 → 240V ac -
RS Stock No. 111-3086
Mfr. Part No.P2RVC-8-I-7-1
BrandOmron
HK$408.54
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- G2RV-SR700-AP Slim I/O Relay - - -
RS Stock No. 472-9288
Mfr. Part No.3RF2920-0HA13
BrandSiemens
HK$1,976.00
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Power Controller 3RF29 - 230V ac 20A
RS Stock No. 111-3085
Mfr. Part No.P2RVC-8-O-7-1
BrandOmron
HK$408.54
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- G2RV-SR700 Slim I/O Relay, G2RV-SR701 Slim I/O Relay, G3RV-SR700 Slim I/O Relay - - -
RS Stock No. 512-881
Mfr. Part No.PTML0024 5-1415036-1
HK$19.70
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Module RT78724, RT78726 - 24V dc -
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