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ASJ20-LD1A Residual Current Relay

ASJ20-LD1A



● The measurement of A-type residual current;

● The streamer display of current percentage;

● The setting of rated residual action current;

● The setting of non-driving time of limitation;

● Two-pair relay output;

● Possessing the function of on-the-spot and long-distance testing and resetting


Description

General


ASJ series residual current action relay can be combined with low voltage circuit breaker or low voltage contactor to form a combined residual current protection device. It is mainly used for TT and TN system distribution lines with AC 50Hz and rated voltage of 400V and below.



Function









Frequency

50Hz±5Hz
Auxiliary power supply
AC110V, AC220V, DC85 ~270V
(permissible error ±10%)
Consumption
≤5W






Installation

DIN rail 35mm

Dimension(L*W*H)
85×54×64mm


Operation Instruction





Installation




Connection




FAQ



Q: How many wires can be passed through a residual current transformer?

Can I just put one firewire? Can I just pass firewire of A, B, C through the sensor?

A: In a three-phase four-wire system, 4 wires should be used. You can’t just pass a firewire,

and A, B, C, N should all be passed through the Residual current transformer. A suitable transformer should be selected according to the wire diameter and rated current on site.


Q: The wire of three phase dand four wire is very thick. Can a measuring sensor be fitted to each phase, and four sensor secendary be passed through small hole size wires. Then connect the residual current relay?

A: Not recommended. By this plan, at the moment of starting the high-power and

high-frequency equipment, the vector sum of the output current of three-phase

four-wire measurement transformer is not zero (directly measured is 0), which can

easily lead to malfunction and tripping.


Q: Can open-type residual current transformers be used in the renovation project?

A: For reconstruct projects, if the wire diameter of the line is less than 100mm, open-type residual current transformers can be used. It is not recommended to use open-type residual current transformers larger than this aperture, because the measurement accuracy of the large aperture sensor is poor.


Q: Why does the residual current relay operate as soon as it is powered on

A: Reason one may be wiring error;  Another may be wrong product selection.


Q: After power-off the ASJ residual current relay, the breaker will trip-out. What's the reason for this phenomenon

A: This phenomenon is that the breaker will trip-out after the protected power supply is cut off; the other is to protect the line when undergoing dual power switching.

ASJ series residual current relay is the type that automatically recovers and resets when the auxiliary power fails.According above-mentioned conditions, the instrument can be selected as the type that does not automatically act when the power fails.


Q: What does In:100A mean on the panel? Can it be removed

A: In means rated current and cannot be removed. It is clearly stipulated in 4.2.2.2 and 5.1 of GB/T 22387-2016, the panel needs to be marked with the rated current or the size of the hole of the residual current transformer.


Application




Package




MINIMUM PACKAGE







MINIMUM PACKAGE


Package dimensions(1 PC)

170*150*130mm

Package Weight(1 PC)

0.5Kg


WHOLE BOX PACKAGE


Package dimensions(36 PCS)

450*240*250mm

Package Weight(36 PCS)

18.5kG


PRODUCT HS CODE


8536490000

ATTENTION !

The above packing and weight data are only refer to model ASJ20-LD1A.

For other models or optional functions, please contact the salesman for details, thank you for your cooperation!




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