Active/Passive RCD Guide


In the latching or Passive units the RCD will remain closed, once set, and will only trip when a hazardous earth fault occurs. If the unit loses supply - perhaps in a power cut - it will stay latched, making it particularly useful in commercial applications, such as controlling refrigeration units.

Latched RCD Accessories

AF4900 13A 2 Gang DP Switch Socket RCD 30mA (Latching)
BG822RCD Nexus White 2G 13A RCD Socket
BGWP22RCD 2G 13A IP66 Latching RCD DP Switched Socket Storm
BGWP55RCD 13A IP66 Switched Latching RCD Spur Storm
BGWPL22RCD 2G 13A IP66 Latching RCD DP Sw Skt Brushed St/St
BRH92 13a 30mA RCD Fused Spur White
KBCU6RCD 13A Fused RCD Spur Unit
KBCU9RCD 13A 2G DP RCD Switched Socket - 30mA - Type A
KBIPRCD 13a 2 Gang DP RCD Switched Outdoor Socket IP66
SMRCD10W RCD White Fused Connection Unit
SMTFP02WL Single 13A RCD Socket
SMTGV104 Vision Single Gang 13A RCD Fused Spur
SMTGV204 Vision Twin Gang 13A Switched RCD Socket Passive

Non latching or Active units also trip when the power supply is lost, so they are useful for domestic applications - like controlling garden and power tools - where a sudden restoration of power might pose safety problems.

Non Latched RCD Accessories

SMTFA03M Single Metalclad RCD Socket - Active
SMTGV205 Vision Twin Gang 13A Switched RCD Socket Active
TLARCD 13 Amp RCD Plug In Adaptor
TLPRCD 13a RCD Safety Plug
MKK56201 Masterseal Plus 30ma RCD Socket Grey
MKK56201W Masterseal Plus 30ma RCD Socket White
MKK56231 Masterseal Plus 2 Gang RCD Sckt Grey (Active)
MKK56231W Masterseal Plus 2 Gang RCD Sckt White (Active)
SMRCD05W 2G 13a RCD Sw Socket White
SMRCD07M 2G 13a RCD Sw Socket Metal Clad

The surface of the sockets will be warm even when the socket is not in use. The surface can safely attain a temperature rise of 52°C when the RCD is on load. Without a load it can be expected that the surface would reach 38°C.

The internal parts are tested to 66°C to comply with the standard

The above information generally applies to the Connection Unit, which is latching type.

Contactum RCD socket outlets

Operating voltage: 220V - 240V AC 50Hz

Current rating: 13 amp

Trip Speed: Less than 40mSec at 150Ma earth faults. BS 7288

Continues to protect with: Lost neutral / Pulsating DC earth faults

Conforms to EU Directives: 72/73/EEC and 89/336/EEC