Ring Main Unit (RMU)

Modular design for flexible expansion.
Equipped with accessories for harsh environments, effectively extending service life in humid and challenging conditions.
Easy to operate, reliable interlocking mechanism, and safe to use.

GET A QUOTE

Detail

Services

We support OEM & ODM services, providing customized solutions based on your specific requirements or manufacturing according to your drawings.

Case

Datasheet

Electrical characteristics		IEC
Rated voltage	U(r) [kV]	36
Rated frequency	f(r) [Hz]	50	60
Rated current
General busbar and cubicle interconnection	I(r) [A]	400/630
Feeder	I(r) [A]	400/630
Rated short-time power frequency withstand voltage (1 min)
Phase-to-earth and between phases	U(d) [kV]	70
Across isolating distance	U(d) [kV]	80
Lightning impulse rated withstand voltage
Phase-to-earth and between phases	U(p) [kV]	170
Across isolating distance	U(d) [kV]	195
Internal arc classification	IEC 62271-200 IAC	AF/AFL 16 kA 1 s/ 20* kA 1 s/25 kA 1 s AFLR ** 16 kA 1 s/ 20 kA 1 s/25 kA 1 s
	IEEE C37.20.7:2017	-
Withstand DC voltage	[kV]	72
Switch-disconnector		IEC 62271-103 + IEC 62271-102
Admissible rated short-time withstand current (main circuit)
Value t(k)= (x) s	I(k) [kA]	16/20*(1/3s)/25(1s)
Peak value	I(p) [kA]	40/50*/62.5	41.6/52*/65
Mainly active current breaking	I(1) [A]	400/630
Vacuum cable breaking capacity	U(a) [A]	50
Closed loop breaking capacity	I(2a) [A]	400/630
Earth fault breaking capacity	I(6a) [A]	160
Vacuum line and cable breaking capacity in earth fault conditions	I(6b) [A]	90
Main switch making capacity (peak value)	I(ma) [kA]	40/50*/62.5	41.6/52*/65
Switch category
Mechanical endurance		1000-M1/5000-M2
Operations cycles(short-circuit making)-class		5-E3
Earthing switch		IEC 62271-102
Admissible rated short-time withstand current (earthing circuit)
Value t(k)=(x)s	I(k) [kA]	16/20*(1/3s)/25(1s)
Peak value	I(p) [kA]	40/50*/62.5	41.6/52*/65
Earthing switch making capacity (peak value)	I(ma) [kA]	40/50*/62.5	41.6/52*/65
Earthing switch category
Mechanical endurance		1000-MO***
Operations cycles(short-circuit making)-class		5-E2

Keywords

ring main unit manufacturer, ring main unit factory, ring main unit supplier, ring main unit OEM, ring main unit ODM, ring main unit China, ring main unit economical, ring main unit wholesale, ring main unit alternatives, rmu units manufacturer, rmu units factory, rmu units supplier, rmu units OEM, rmu units ODM, rmu units China, rmu units economical, rmu units wholesale, rmu units alternatives