AM4 Protection Relay


● A complete set of protection, related to the application;

● 4 current input, 4 voltage input, 12DI, 5DO;

● Auxiliary power supply adapts with AC220V, DC220V, DC110V, AC110V;

● 1 RS485 serial communication, IEC60870-5-103 and Modbus-RTU;

● 1 RS232 for user update;

● 1 GPS for GPS timing;

● More than 200 sequence of event records, more than 400 system logs, and more than 10 seconds tripping context records;

● Powerful graphic programmable Logic.



AM series protection relay are applicable to the user substation which the input voltage is 35kv and below. We adopt mature technology solutions to ensure the quality of the AM relay.The AM relay are widely used in substations, subsection posts and ring main units for office buildings, commercial buildings, communication buildings, mine buildings and so on.

Technical Datasheet

Rated Parameter
Power SupplyPower supply:AC/DC220V,Or AC/DC110V,oR DC48V(Reference the wiring diagram)
Range:Power supply x (1±20%)
Maximum power consumption:≤10W(DC)
Rated VoltageRated Voltage:AC100V
Power Consumption:≤0.5VA(Single phase)
Overload capacity:1.2 times rated voltage for continous work;2 times for 10 seconds
Rated CurrentRated current:AC 5A/1A(See the device wiring diagram)
Power consumption:≤0.5VA(Single phase)
Over capacity:2 times rated current for continuous work;40 times for 1 second
FrequencyRated frequency:50Hz or 60 Hz
Digital InutRated Voltage:AC/DC220V,AC/DC110V,DC48V(Similar to power supply)
Voltage Range:Rated voltage x (1±20%)
Power Consumption:≤1W(DC220V)(Single channel)
Digital OutputMechanical life:≥10000 times
Switching capacity:≥1000W,L/R=40ms
On current:continuous≥5A short time(200ms)≥30A
Interrupting capacity:≥30W,L/R=40ms
Normal Working ConditionsAmbient temperature:-10℃~+55℃
Device storage,transport allows the ambient temperature is -25℃~+70℃
Relative humidity:5%~95%(The product does

LCD Display






Q: How to set the CT and PT ratio of the protection device?

A:The protection device can set the CT and PT ratio through the fixed value menu. For example, the current transformer is 75/5 and the voltage transformer is 10/0.1, then the CT ratio is set to 15 and the PT ratio is set to 100.

Q: For AM4, if you want to place a circuit line protection and transformer protection, how to distinguish the model?

A: AM4 is suitable for circuit protection and transformer protection. No need to distinguish between models when placing orders

Q: When the voltage is three-phase three-wire system, does the current have to be connected with 2CT?

A: The voltage wiring mode and current wiring mode of the protection device can be set independently, and can be connected freely.

Q: How to confirm whether the anti-trip function is configured?

A: If the circuit breaker is equipped with anti-trip, the device does not must be equipped with anti-trip; if the circuit

breaker does not have anti-trip, you need to configure the AM5-FT anti-trip module. (If DC48V is selected as the

operating power supply, the anti-trip box is not optional, and the circuit breaker must be equipped with anti-trip

function; if you choose AC anti-trip, please note that AC and DC general anti-tripping)

Q: How to purchase suitable protection devices?

A: Before ordering, it is recommended to consult related engineers, select the appropriate protection model,

and then fill in the corresponding selection table, and place the order after confirmation by the engineers.


HS Code: 8536300000

Net Weight: 3.46kg/pcs

Package Size:260×280×250mm

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