MS220C
12150-0703-03
Seite
3 / 8
www.ziehl.de
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Summary of functions
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1 PTC-resistor set with up to 6 PTC Sensors in series
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Sensors and relays are exchangeable
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Sensors with fixed nominal response temperature 60...180°C
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Suitable with thermal contacts
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Relay output with change-over contact (co), floating extern
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Snap mounting on standard rails or screw mounting
A current monitors
continuously the resistance of the sensors. In cold state, the resistance is < 250 Ω per
sensor (sensor circuit < 1,5 kΩ). The relay has picked up and contact 11/14 is closed. The resistance of the
sensor rises rapidly at nominal response temperature NRT. The relay release at a resistance between
2650
Ω < R < 4000 Ω
. The relay switches on automatically at a resistance
1650 Ω < R < 2650 Ω.
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Connecting diagram:
Us = supply voltage
S1 = push-button OFF
S2 = push-button ON
H1 = indicator lamp fault
F1-F4 = fuses
K1 = contactor
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Function diagram
Caution! Tripping is not stored and is not non-volatile!
The released relay switches on automatically after a voltage dip.
