ABB S2C-S/H6R Signal and Auxiliary Contact for S200 MCBs

The S2C-S/H6R is a signal and auxiliary contact from ABB’s System pro M compact range, order code 2CDS200922R0001. It lets the user choose between two modes: showing whether the device’s contacts are open or closed, or flagging a fault. For MCBs and RCBOs the fault signal covers overcurrent and short-circuit events, and for RCCBs and RCBOs it covers earth faults. It is compatible with S 200, S300P, SN 201, F 200, DS201, DS202C, DS 200 and SD200 devices. Breakers are listed under circuit breakers, and the SACE Tmax XT range covers larger currents.

Technical specifications

Using the S/H contact as signal or auxiliary contact

The S 200 data sheet lists the S2C-S/H6R twice: as the signal/auxiliary contact S/H and as the same part used as an auxiliary contact S/H (H). In signal mode the contact tells a controller that the protective device tripped, which is useful for alarm panels and remote monitoring, since a handle position alone does not show if a device opened by itself. In auxiliary mode it behaves like the S2C-H6R and follows the open or closed state.

Selection and confirmation

Check the series of the device on the rail against the list above and decide whether the circuit needs fault signalling, position indication or both, as one S2C-S/H6R serves only one selected mode at a time. The official product page gives the function and the compatible devices but not the contact ratings, so confirm the rated voltage and current with ABB documentation before wiring it to a PLC input. Also confirm the number of side accessories the breaker accepts.

Combining with other accessories

The S 200 data sheet lists the side-mounted signal and auxiliary contacts together with the shunt trip (S2C-A…), undervoltage release (S2C-UA), overvoltage release (S2C-OVP), motor operating device (S2C-CM), mechanical tripping device (S2C-BP) and the neutral disconnector (S2C-Nt). It also carries a warning that when an S 200 or S 200 M is coupled with a DDA 200 RCD block, the motor operating device does not operate in case of an earth-leakage fault. Plan the accessory stack on each breaker with these notes in mind, and confirm with ABB how many side elements one breaker accepts.

Deciding which mode each circuit needs

The practical question when specifying the S2C-S/H6R is what the operator or control system needs to know about each outgoing circuit. For feeders that matter to the process, such as a pump, a cooling fan or a control supply, fault signalling is usually the better choice: it separates a breaker that tripped on overcurrent, short circuit or earth fault from one that was simply switched off by an electrician. For circuits where the PLC or building management system only needs to confirm that a supply is on, position indication is enough, and the same part can be set up to provide it.

Because one unit serves only one selected mode at a time, a circuit that needs both a trip alarm and a position signal will need a second side-mounted contact, such as the S2C-H6R auxiliary contact listed among the related types. Count these early, since each extra element adds width on the DIN rail and takes up one of the side-accessory positions the breaker accepts.

Information to collect for each breaker

• The exact series of the protective device, checked against the compatibility list (S 200, S300P, SN 201, F 200, DS201, DS202C, DS 200, SD200).
• Whether the device is an MCB, RCCB or RCBO, since this defines which faults the signal will report.
• The mode needed: fault signalling or contact position indication.
• Any other accessories planned on the same breaker, such as a shunt trip or undervoltage release.
• The voltage and type of the input the contact will be wired to, to be checked against ABB’s contact ratings.

Fitting and testing on the panel

Isolate the board before working on it, then mount the contact on the side of the breaker following the ABB instructions supplied with the part, and confirm it is seated securely before reinstalling the device on the rail. Label the contact wiring clearly with the circuit it monitors, because in a large distribution board a trip signal is only useful if the maintenance team can find the breaker it came from. During commissioning, operate the breaker by hand and check that the remote indication changes as expected; where fault signalling is used and the switchboard testing procedure allows it, verify the trip signal as well, for example using the RCD test button on an RCBO.

Troubleshooting and site conditions in Oman

If an alarm panel shows a trip that cannot be found on the board, first check that the contact is set to the intended mode and that the wiring matches the labelling. A signal that never changes usually points to a loose terminal or a contact that is not properly engaged with the breaker. In the Gulf, distribution boards in plant rooms and rooftop enclosures often run hot and collect fine dust, so keep panels closed, ensure enclosure ventilation or cooling is working, and include the auxiliary contact terminals in the periodic tightness check. In coastal installations, a well-sealed enclosure also helps protect the small signal terminals from humid, salty air.

Ordering and documents

Order the part by type S2C-S/H6R or code 2CDS200922R0001. The linked ABB S 200 data sheet shows the accessory overview. Seven Star LLC is an independent supplier in Muscat and quotes on request; no price or stock is shown on this page.