Model: WE 77/Ex-2
2-channel
Control circuit EEx ia IIC
115 V AC supply voltage
Reversible mode of operation
Lead breakage (LB) monitoring
1 relay contact output (change-over contact) per channel
Signal type Digital Input
Connection terminals 17, 18
Rated voltage 103.5 ... 126 V AC , 45 ... 65 Hz
Power dissipation 2.5 W
Power consumption approx. 3.2 VA

Input
Connection side field side
Connection terminals 1-, 2+; 8+, 9-
Rated values acc. to EN 60947-5-6 (NAMUR), see system description for electrical data
Open circuit voltage/short-circuit current approx. 8 V DC / approx. 8 mA
Switching point/switching hysteresis 1.2 ... 2.1 mA / approx. 0.2 mA
Pulse/Pause ratio min. 0.5 ms / min. 0.5 ms
Line fault detection breakage I ≤ 0.1 mA

Output
Connection side control side
Connection terminals 10, 11, 12; 13, 14, 15
Output signal ; relay
Contact loading 253 V AC/2 A/500 VA/cos φ min. 0,7; 125 V AC/4 A/500 VA cos φ min. 0,7; 40 V DC/2 A/80 W ohmic load
Energized/De-energized delay approx. 10 ms / approx. 20 ms
Mechanical life 107 switching cycles

Switching frequency < 10 Hz
Display elements LEDs
Degree of protection IEC 60529
Ambient temperature -20 ... 60 °C (-4 ... 140 °F)

Mechanical specifications
Degree of protection IP20
Connection screw terminals
Mass approx. 410 g
Dimensions 60 x 104 x 110 mm (2.4 x 4.1 x 4.3 inch)