• 3-pole AC power contactor in the performance class up to 3,000 volts nominal voltage and 800 amps continuous current
• High short-circuit breaking capacity for frequencies
• up to 400 Hertz
• Double-break contacts
• Compact, rugged design

The CA works in a wide range of AC applications. For example, it connects the central inverter of a photovoltaic system with the grid or works as a traction contactor in electrical multiple units. The CA complies with the following railway standards:

• IEC 60077-1: Railway applications – Electric equipment for rolling stock – Part 1: General service conditions and
• general rules
• IEC 60077-2: Railway applications – Electric equipment for rolling stock – Part 2: Electrotechnical components – General rules
• IEC 61373 Railway applications – Rolling stock equipment – Shock and vibration tests
• IEC 62497-1: Railway applications – Insulation coordination – Part 1: Basic requirements – Clearances and creepage distances for all electrical and electronic equipment
• EN 50125-1: Railway applications – Environmental conditions for equipment – Part 1: Equipment on board rolling stock

• Function insulation of the main electric circuits from one another
• Basic insulation between main electric circuits and earth (phase to earth in each case)
• Reinforced insulation between main and control electric circuits

Snap-action switches can report the switch state of the main contacts to the higher-level control system. Different versions are possible, achieved with the switches S870, S970 or S826.

• Simple visual inspection and replacement of the main contact pieces
• Simple replacement of the arcing chambers

The switching devices are used on the AC side in the output circuit of inverters and are capable of disconnecting large loads. The switchgear is thus a cost-effective alternative to circuit breakers for safely disconnecting central inverters from the mains and reconnecting them to the mains.

CA contactors are required for reliable disconnection of inverter-fed permanent magnet drive motors (PEM) in the event of a fault, for example in the event of a short circuit in the output circuit of the traction converter. The contactors are particularly suitable for permanently excited drive motors with higher supply voltage frequencies.