C294 – Double pole DC contactor up to 1,500 V

Compact DC contactor (2 make contacts) with optimised design for 1,500 V rated insulation voltage. Frequent switching under load.

C294 A
Compact double pole DC contactor with blowout magnets, electric arc arcing chamber and quenching plates. S870 snap-action switch as an optional auxiliary contact.

The double pole DC contactor C294 can switch on and carry high currents. It was designed for switching frequently under load. Thanks to an optimised design, the C294 achieves a rated insulation voltage of 1,500 volts in a compact design.

In order to control switching arcs safely, design A possesses blowout magnets, arcing chambers and quenching plates. Using an auxiliary switch, the contact state can be reported to the higher-level control system.

Developed for use in transport technology, the C294 can be used in a wide range of DC applications – even in extreme temperatures of minus 40 to plus 70 degrees Celsius. This is an especially reliable piece of switchgear with a longer-than-average electrical service life.

Features

1,500 volt rated insulation voltage in a compact design

The double pole DC contactor C294 offers a rated insulation voltage of 1,500 volts with minimal dimensions. In order to achieve the prescribed insulation parameters (clearance and creepage distances), the design has been optimised.

The rated voltage is 1,000 volts per contact system and 1,500 volts for the series connection of both poles.

Electric arcs managed using blowout magnets, arcing chambers and quenching plates

During switch off, an electric arc is ignited between the opening contacts. The current flows on through the ionised air. Permanent magnets drive the ionised air out of the contact zone into the arcing chamber. Here, the electric arc is extended and cooled until it goes out.

Each contact system of the C294 DC contactor disconnects currents of up to 60 A with a voltage of 1,000 V (L/R = 1 ms). If the main contacts are connected in series, the C294 disconnects currents of up to 120A with 1,500 V (L/R = 1 ms).

Optional auxiliary contact with snap-action switch

An S870 snap-action switch reports the switch state of both contact systems to the higher-level control system. This changeover contact with positive opening is suitable for safety applications.

Electrical service life: 600,000 switching operations

The C294 is designed for switching loads frequently. The electrical service life is 600,000 switching operations (Ui = 1,200 V DC, I = 30 A, L/R = 1 ms, per contact system).

Ambient temperature: –40°C up to +70°C

Based on its approval for rail applications (EN 60077-1, EN 60077-2), the contactor can also be used in extreme ambient temperatures.

Main and pre-charging contactor in DC applications up to 1,500 volts

The two-pole DC contactor can switch up to 1,000 volts per contact system; in-series connections up to 1,500 volts. In battery systems, the positive and negative pole can be connected through one pole of the C294 in each case. The contactor can be used in all DC applications in which the load only has to be switched off in one direction:

  • Railway technology
  • Electric vehicles
  • DC drives of machinery
  • Pre-charging contactor
In battery systems, the positive and negative pole can be connected through one pole of the C294 in each case.

Specifications

C294
Type of voltageDC
Contact configuration2 x NO
Nominal voltage Un1,000 V
Rated insulation voltage Ui1,200 V
Rated impulse withstand voltage Uimp8 kV
Conv. thermal current Ith40 A
Making capacity, resistive T = 0 ms550 A
Breaking capacity1,200 V DC, L/R 1 ms: 60 A; L/R 15 ms: 13 A
1,500 V DC, L/R 1 ms: 120 A; L/R 15 ms: 30 A
Contact material main contactsAgSnO2
Aux. contact1 x snap switch S870, SPDT, optional
Coil voltage Us24, 36, 72, 110 V DC
Coil tolerance Us-30% ... +25%
Coil power consumptionapprox. 18 W / approx. 13 W (cold / warm)
IP rating (IEC 60529)IP00
Mechanical endurance> 3 million operating cycles
Shock5 g (20 ms half sinus)
Vibration2 g (5 ... 150 Hz)
Temperature range-40 °C ... +70 °C
Storage temperature-40 °C ... +70 °C
Weight1,000

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