ER95: Ground - Fault Relay

- ป้องกันกระแสรั่วลง Ground

- ตั้งหน่วงเวลาได้ 0 - 1 sec

            Ground-Fault Relay ER95 is an equipment for detect Ground-Fault Current. It operate with external CT/5A (Current Transformer) It can operate in 2 mode as the following.

            Auto Reset Mode

            When Ground-Fault Current is over “Current” Setpoint. The internal relay will on and terminal “9” will break from terminal “11” and connect with terminal “10”.  When Ground-Fault Current drop below “Current” Setpoint. The internal relay will off and the contact will switch back to the first stage.

            Manual Reset Mode

            to operate in this mode the cable have to short between terminal “5” and terminal “6”. When Ground-Fault Current is over “Current” Setpoint. The Internal relay will on but when Ground-Fault Current drop below “Current” Setpoint the relay will not off you have to push the “Reset” button the relay will off.

            The scale of “Current” Setting knob is depend on CT Ration that connect with ER95 as the following formula

            "Current" Setting = (Ground - Fault Current) / CT Ratio

            Example using CT 500/5A and want to set Ground-Fault Current trip at 30A. From the formular

            "Current" Setting = (30 x 5) / 500 = 0.3

            From the calculation you have to set  “Current” knob at 0.3



Number of Channel:

1 Channel

Input Type:

Current (AC)

Input Range:

0 to 1 Aac (1 VA Max.)


2 x Rating Continuously, 10 x Rating for 3 sec

Setting Current:

0 to 1 A

Time Delay:

Adjustable 0 to 1 sec.

Operating Mode:

"Auto Reset" or "Manual Reset" Mode Selectable

Relay Output

Number of Channel:

1 Channel

Relay Type:

N.O., N.C. (SPDT)

Contact Rating:

3 A @ 250 VAC

Power Requirements

Power Supply:

110, 220VAC

Environmental Limits

Operating Temperature:

0 to 55 °C

Operating Humidity:

5 to 95 %RH

Storage Temperature:

0 to 70 °C

Physical Characteristics


W50 x H70 x D130 mm.


Wall or DIN rail


Plug-in 11 pins socket


Screw terminals on base socket


Warranty Period:

5 year

Ordering Information: Specify Power Supply
Example ER95/220VAC

Package Checklist

1. ER95