Emax Low voltage air circuit-breakers - ABB Download Center

Using the SACE RCQ switchboardelectronic residual current relaysThe family of SACE Emax circuit-breakers with a rated currentup to 2000A can be combined, if fitted with a shunt opening tripunit, with the SACE RCQ residual current relay for switchboardwith a separate toroidal transformer (for installation outside onthe line conductors) thereby enabling earth leakage currentsto be determined for values between 0.03 and 30A.Thanks to the wide range of settings, the SACE RCQ switchboardrelay is suitable for applications where a residual current protectionsystem coordinated with the various distribution levels is tobe constructed from the main switchgear to the final load.It is particularly suitable, forexample, where low-sensitivityresidual current protection isrequired in both partial (current-type)and total (time-type)selective chains, and for highsensitivityapplications to protectpeople against indirectcontact.When the auxiliary power supplyvoltage drops, the openingcommand intervenes aftera minimum time of 100msand after the time set above100ms.The SACE RCQ relay is onlysuitable for use in the presenceof alternating earth current (Type AC), for alternating and/or pulsating current with continuous components (Type A), andis suitable for achieving residual current selectivity.The SACE RCQ relay acts indirectly, and works on the trip unitmechanism of the circuit-breaker by means of the circuit-breakershunt opening trip unit (to be ordered by the customer) to behoused in the circuit-breaker itself.The table below shows the main characteristics of the SACERCQ relay.SACE RCQ residual current switchboard relayPower supply voltage AC [V] 80 ... 500DC [V] 48 ... 125Tripping threshold setting IΔn- 1 st setting range [A] 0.03 - 0.05 - 0.1 - 0.3 - 0.5- 2 nd setting range [A] 1 - 3 - 5 - 10 - 30Trip time settings 1 a range [s] 0 - 0.05 - 0.1 - 0.25Trip time settings 2 a range [s] 0.5 - 1 - 2.5 - 5Range of use of closed transformers- Toroidal transformer ∅ 60mm [A] 0.03 ... 30- Toroidal transformer ∅ 110mm [A] 0.03 ... 30Range of use of transformers that can be opened- Toroidal transformer ∅ 110mm [A] 0.3 ... 30- Toroidal transformer ∅180mm [A] 0.1 ... 30- Toroidal transformer ∅ 230mm [A] 0.1 ... 30Dimensions (Dx H x W) [mm] 96 x 96 x 131.5Drilling for assembly on door [mm] 92 x 926Dimensions of the external toroid for SACE RCQOuter dimensions of the toroid Closed OpenableD [mm] 94 165 166 241 297HW [mm] 118 160 200 236 292DW H [mm] 81 40 81 81 81Internal diameter Ø [mm] 60 110 110 180 230ABB SACE 6/25