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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Description Price Accessory Type For Use With Series Voltage Current Rating
RS Stock No. 666-8015
Mfr. Part No.99.02.9.024.99
BrandFinder
$11.20
Each
units
- - 99 Series 24V dc -
RS Stock No. 251-9455
Mfr. Part No.2966016
$25.76
Each
units
- - PLC-BSC 24V dc -
RS Stock No. 827-7182
Mfr. Part No.ZBRA1
$289.31
Each
units
Relay Antenna XB4R 22 mm (Dia) Control Unit, XB5R - 24 → 240V ac -
RS Stock No. 111-3083
Mfr. Part No.P2RVC-8-O-5-1
BrandOmron
$79.56
Each
units
- G2RV-SR500 Slim I/O Relay, G2RV-SR501 Slim I/O Relay, G3RV-SR500 Slim I/O Relay - - -
RS Stock No. 153-220
Mfr. Part No.P2RVC-8-O-F
BrandOmron
$135.39
Each
units
Interface Slim Relay - - -
RS Stock No. 410-8035
Mfr. Part No.2296058
$179.60
Each
units
- - PLC-V8/D15S/OUT 24V dc 3A
RS Stock No. 776-1686
Mfr. Part No.093.01
BrandFinder
$3.63
Each
units
Separator 93 Series 93 Series - -
RS Stock No. 472-9143
Mfr. Part No.3RF2950-0HA16
BrandSiemens
$488.64
Each
units
Power Controller 3RF29 - 24V dc 50A
RS Stock No. 508-0253
Mfr. Part No.2833738
$14.45
Each
units
Plug In Module PR1 Series, PR2 Series LV-120-230AC/110VDC 110V dc -
RS Stock No. 111-3085
Mfr. Part No.P2RVC-8-O-7-1
BrandOmron
$68.19
Each
units
- G2RV-SR700 Slim I/O Relay, G2RV-SR701 Slim I/O Relay, G3RV-SR700 Slim I/O Relay - - -
RS Stock No. 508-0556
Mfr. Part No.2833712
$14.45
Each
units
Plug In Module PR1 Series, PR2 Series LV- 12- 24UC 110V dc -
RS Stock No. 776-1535
Mfr. Part No.093.60
BrandFinder
$2.11
Each
units
Separator 39 Series 93 Series - -
RS Stock No. 472-9171
Mfr. Part No.3RF2950-0HA13
BrandSiemens
$466.25
Each
units
Power Controller 3RF29 - 230V ac 50A
RS Stock No. 231-3257
Mfr. Part No.84130105
BrandCrouzet
$97.11
Each
units
- - - 32V dc 5A
RS Stock No. 494-0700
Mfr. Part No.PTMG0024 2-1415036-1
$6.65
Each
units
LED Module RT Series - 24V dc -
New
RS Stock No. 192-1130
Mfr. Part No.1SVR405651R3000
BrandABB
$14.18
Each
units
Socket 2 or 4 c/o (SPDT) Contacts CR-M Relays - - -
New
RS Stock No. 192-1129
Mfr. Part No.1SNA645071R0000
BrandABB
$25.09
Each
units
Interface Relay - - 24V dc -
RS Stock No. 508-0203
Mfr. Part No.2833657
$13.32
Each
units
Plug In Module PR1 Series, PR2 Series LDP- 12- 24DC 24V dc -
RS Stock No. 472-9288
Mfr. Part No.3RF2920-0HA13
BrandSiemens
$385.04
Each
units
Power Controller 3RF29 - 230V ac 20A
RS Stock No. 494-0744
Mfr. Part No.PTML0024 5-1415036-1
$5.75
Each
units
Module RT78724, RT78726 - 24V dc -
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158 mm wide relay interfaces, for assembly on 35 mm DIN rail, ideal for PLC interfacing.Available in electro-mechanical version.Connection by spring terminals for fast wiring of the conductors.Supplied with voltage indicator lamp and coil protection.Extraction and retaining clip.