MR MESSKO MTRAB - Cable Recommendation

6 Electrical connection
53BA6820378-03 EN
Suitable equipment includes isolating devices in accordance with IEC
60947-1 and IEC 60947-3 (e.g. circuit breakers). Note the properties of the
relevant circuits (voltage, maximum currents) when selecting the circuit
breaker type. In addition, observe the following:
▪ It must be easy for the operator to access the isolating device.
▪ The isolating device must be labeled for the device and circuits to be iso-
lated.
▪ The isolating device may not be a part of the power line.
▪ The isolating device may not interrupt the main protective conductor.
Miniature circuit breaker
You must fuse the power supply circuit with a miniature circuit breaker. The
miniature circuit breaker must have the following properties:
▪ Rated current: 16 A or 20 A
▪ Triggering characteristic: C, K, Z
Conductor cross-section
For the power supply circuit, use a conductor cross-section suitable for the
miniature circuit breaker that you have selected, but at least 1.5mm
2
(AWG
15).
6.3 Cable recommendation
Please note the following Messko GmbH recommendation when wiring the
device:
▪ Excessive line capacitance can prevent the relay contacts from interrupt-
ing the contact current. In control circuits operated with alternating current,
take into account the effect of the line capacitance of long control cables
on the function of the relay contacts.
▪ The connection cables used must have a temperature resistance of at
least +90°C (ambient temperature max. +70°C plus intrinsic device heat-
ing of 20K).