High-voltage contactor

B88269X*

Gas-filled contactor for high-voltage DC switching

HVC50

PPD AB PD / PPD AB PM

Version: 01 / 2024-10-14

Please read Cautions and warnings and

Page 10 of 13

Important notes at the end of this document.



Switching capacitive loads can lead to high inrush currents and can cause welding of the main

connections (tack-welding). These inrush currents need to be limited as much as possible. Even

short inrush currents in the microsecond range can lead to tack-welding. Please ensure with

appropriate pre-charging that the differential voltage across the main terminals is as low as

possible when closing the contactor. Please ensure that any connected capacitances are pre-

charged to a minimum of 98% (5 time constants).



In the event of a break under inductive load, the voltage at the connection terminals must not

exceed the nominal operating voltage by more than 10%. Break of inductive loads with time

constant greater than 1 ms will shorten the lifetime. Failure may also occur.



The contactor is bi-directional (no polarity of main connections). The service life curves are

estimated based on the requirements of IEC 60947-4-1 Chapter 8.2.4, where 50% of the

operations are performed in positive direction and 50% in negative direction.



After long-term operation, the contactor coil resistance is increased due to the temperature rise. If

the contactor is switched on immediately afterwards, the coil characteristics may be deteriorated.



In the event of a current exceeding the maximum breaking current by more than 50% or

triggering a series fuse, the contactor must be considered damaged and replaced.



The lifetime depends on several factors like e.g. load type, driving circuit and ambient conditions.

We recommend checking the performance of the part under actual conditions.



Simultaneously applied maximum operation parameters for e.g. coil voltage, over currents,

temperature, vibration etc. may lead to reduced lifetime. We recommend applying rated settings

to achieve optimum life performance.



The contactor must not be operated without any load. This may increase the contact resistance.



The operating life of the contactor can be affected by strong magnetic fields. Please ensure that

there are no magnetic field sources in proximity and avoid nearby installed heat sources.



We recommend separating or shielding the low voltage side (coil and auxiliary connections if

available) from the high voltage side (main connection terminals).



The coil input voltage needs to be kept stable and without disturbances. It should always remain

above the minimum value of the coil voltage operation range specified in the datasheet.



Distortions of the DC supply of the contactor may influence the electronics. Superimposed

voltages at frequencies > 10 Hz and > 3 V peak to peak must be avoided. Otherwise, the coil

may become hot and fail.



For a successful pick-up, the coil voltage cannot be ramped up slowly. It needs to be applied

instantly (within less than 1 ms) to at least the maximum pick-up voltage. For a successful

breaking, the coil voltage cannot be ramped down slowly. It needs to be switched off instantly

(within less than 1 ms).



The contactor is not intended to be used with pulse width modulation (PWM) controllers. Please

contact TDK for details.



To protect the coil contacts from overvoltage when switching off, a protection device is installed in

parallel to the coil. No further protection device shall be used.



This contactor is equipped with two coils (dual coil). Both coils are active during pick-up. After

approximately 200 ms, one coil will be removed electronically from the circuit.



Fast and consecutive switching of the contactor is not allowed. The minimum off time is 5 s. If

switching happens in faster cycles, the coil may become hot and fail.



The auxiliary contact (“stuck detection”) is no real parallel contact. It delivers only an indirect

source of information about the actual switching status.