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Protection and safety
E 236 undervoltage monitoring relays

Technical features
5
US 1.1 US 2.1 US 1.1D
Supply circuit
Supply voltage (= measured voltage) 3N~ 400/230 V AC (terminals N-C1-C2-C3)
Overvoltage permanent 3N~ 459/265 V AC
Rated frequency 48 – 63 Hz (AC sinus)
Rated surge voltage: 4 kV
Overvoltage category III
E 236 Output circuit (isolated two-way-switch)
Rated voltage 250 V AC
Switiching capacity 1250 VA (5 A/250 V AC)
Continuous current 1250 VA (5 A/250 V AC)
Fuse protection 5 A flink
Serviceable life, mechanical 15x106 switchover cycles
Serviceable life, electric 2x105 switchover cycles at 1.000 VA resistive load
Max. switching rate max. 6/min at 1.000 VA resistive load
max. 60/min at 100 VA resistive load
Trip delay ca. 200 ms
Pick-up delay (US 1.1D) 0.1 – 10 min
Accuracy under constant conditions ≤ 5 % of full scale value
– setting accuracy (US 2.1/1.1D) ≤ 2 %
– repeat accuracy
– temperature effect ≤ 1 %
Ambient temperature – 25° to + 55 °C
Terminals 1 x 0.5 to 2.5 mm² with/without connector sleeve
1 x 4 mm² without connector sleeve
2 x 0.5 to 1.5 mm² with/without connector sleeve
2 x 2.5 mm² without connector sleeve
Pick-up torque max. 1 Nm
Mounting position optional
Vibration resistance 10 to 55 Hz 0.35 mm (IEC 68-2-6)
Shock resistance 15 g 11 ms (IEC 68-2-27)
Reference standards VDE 0110 und VDE 0435
EMC tests EN 61000-6-2 and EN 61000-6-4
Back-up fuse ≤ 16 A
Displays green LED U/t ON all 3 voltages ok
green LED U/t flashes time-out indication
yellow LED ON/OFF position of output relay

All measured inputs have to be connected to one phase each. If no three-phase measure-
ment should be carried out, measured inputs have to be connected to one phase to apply the
required voltage to all measured inputs. If a load causes inverse voltage exceeding the
threshold value Us, phase failures cannot be identified.
A neutral conductor must be connected in any case!