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German Railway Track Equipment (Zhejiang) Co., Ltd.


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JWJXC-7200 stepless enhanced contact relay
  • Product Details

Product Usage

The JWJXC-7200 type stepless enhanced contact relay is used as a power supply supervisory relay for the electric point machine in the power supply screen of a large station.

Product function

JWJXC-7200 type stepless enhanced contact relay is a commonly used electrical appliance in automatic control systems. It is used to connect and disconnect circuits, to issue control commands and reflect the status of equipment to form automatic control and remote control circuits.

Applicable environment

The applicable environment of the relay is:

a) Ambient temperature: -40℃~+60℃;

b) Relative humidity: not more than 90% (temperature +25°C);

c) Air pressure: not less than 70kPa (equivalent to an altitude below 3000m);

d) Vibration: the vibration frequency is not more than 15Hz, and the amplitude is not more than 0.45mm;

e) Working position: horizontal;

f) There should be no harmful gas causing explosion hazard around, and good dust-proof measures should be taken.

product structure

The electromagnetic system of the stepless strengthened contact relay is a stepless magnetic circuit with an enlarged size. The contact system is composed of two parts: a normal contact and a strong contact. The normal contact is the same as the stepless relay. Switches, switch start, etc.) designed contacts and isolator.

Mechanical properties

Number of contact groups: 4QJ; 2H

Identification pin number: 14, 55;

Strengthen the contact gap: not less than 7mm;

Ordinary contact gap: not less than 4.5mm;

Reinforce the gap of the support plate: generally not less than 0.35mm;

Reinforce the gap of the support: the reinforcement is not less than 0.1-0.3mm;

Strengthen contact pressure: dynamic closing is not less than 600mN;

Ordinary contact pressure: dynamic breaking is not less than 200mN;

Contact uniformity error: not more than 0.20mm.

Electrical characteristics

Electrical characteristics (at +20℃)

Coil resistance: 3600 (1±10%) Ω×2

The coils are connected in series, connect 2, 3 to use 1, 4;

Rated value: DC220V;

Magnetizing value: DC220V;

Working value: not more than DC85V;

Release value: not less than DC30V;

Time characteristics (at rated voltage): the pull-in time is not less than 0.1S;

Time characteristics (at rated voltage): the release time is not less than 0.1S;

Contact resistance: not more than 0.10Ω.


Daily maintenance and maintenance items are as follows:

a) Keep the relay and socket clean;

b) Observe whether the relay operation status is normal;

c) The relay should be replaced in time for abnormal operating conditions and serious contact burnout.

Regular maintenance

In the electrical life and life management cycle of the relay, the maintenance cycle of the stepless relay and the rectifier relay should be five years;

The overhaul period of stepless enhanced contact relays, poled relays and biased pole relays should be three years;

The overhaul period of stepped reinforced contact relays should be one year.

Appearance inspection and performance inspection should be carried out after the overhaul.

Insulation withstand voltage

Under the standard atmospheric conditions of the test, the insulation resistance of the relay should not be less than 100MQ.

Under the condition that the air pressure is not lower than 86kPa (equivalent to the altitude below 1000m), the insulation withstand voltage of the relay should be able to withstand AC sine wave 50Hz, 2000V rms voltage, there should be no breakdown flashover after 1min, the voltage when repeating the test Should be 75% of the original test voltage value.

Installation Precautions

(1) When installing the relay, make sure that the insulation interval between the sockets is intact, the socket hanging spring is intact, and that the socket identification pin is in the correct position and should not be missing.

(2) Pay attention to the relative position between the relay and the socket when plugging in the relay to avoid damage to the relay or socket during broadcasting.

(3) When repairing and replacing the relay, first remove the fixed relay spring, and then pull out the relay. Do not use excessive force or shake left and right when pulling it out, as it may damage the relay or socket.

Product electrical life

The relay contacts are connected to DC24V1A resistive load; its electrical life is 2×106 times.


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German Railway Track Equipment (Zhejiang) Co., Ltd.


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