RMU and switchgear RMU and switchgear Mefi01 (Electrical) (OP) 15 Dec 17 11:51 Hello friends, could someone please explain the main difference between a ring main unit and MV switchgear. in a substation do we have to have the two? RE: RMU and switchgear ScottyUK (Electrical) 15 Dec 17 13:03 Switchgear is a fairly generic term for equipment which incorporates switches or circuit breakers. An RMU is a specific type of switchgear comprising a pair of switches for a ring circuit to loop in and out, plus a switch-fuse or breaker for the tap-off feeding the load, all integrated into a single unit. RE: RMU and switchgear vijaypandiyan (Electrical) 20 Dec 17 05:29 In MV switchgear, you can have incomings and outgoings as per load. But in RMU it is mainly two incomings+1 outgoing so that your outgoing power is not disturbed. Thanks, Vijay RE: RMU and switchgear krisys (Electrical) 20 Dec 17 10:12 But, RMUs with multiple feeders are also available in the market. This is a variation of the basic RMU. RMUs are mostly suitable for outdoor installation with minimum protection and controls. In some cases even the external control supply also not use. RE: RMU and switchgear vijaypandiyan (Electrical) 21 Dec 17 05:01 Agree with Krisys. Maybe you can check ABB Safeplus for more details. Thanks, Vijay RE: RMU and switchgear Padlock01 (Electrical) 8 Jan 18 09:05 I am currently using Schneider 12kV RMU's in Minisubs (630A Isolator/200A Breaker/200A Breaker) and as a Main 11kV Switchboard 20kA we find its a cheaper option than the withdrawable type. One can add features such as standoff trip/close facility. The VIP410E protection relay has adequate settings. RE: RMU and switchgear krisys (Electrical) 8 Jan 18 10:14 For the Schneider Make RMUs, you don't need a separate control power supply. It uses the self powered release mechanism. This is a specific advantage, when it comes to the remote area, where providing a dedicated control power supply is a problem.