Main Switch Incl. Fuses Or Main Circuit Breaker (Option L26) - Siemens SINAMICS S150 Operating Instructions Manual

4.9.4

Main switch incl. fuses or main circuit breaker (option L26)

Description
Up to 800 A, a load interrupter with externally-mounted fuses is used as the main circuit
breaker. Above 800 A, the standard circuit breaker is used. The circuit breaker is energized
and supplied within the converter.
Connection
Table 4-22
Terminal
NO: normally-open contact, NC: normally-closed contact, COM: mid-position contact
1)
Max. connectable cross-section: 4 mm² (AWG 10)
At currents of more than 800 A and with a live supply voltage, dangerous voltages are
present in the cabinet unit even when the main circuit breaker is open. The upstream
protective gear must be de-energized when working on cabinets.
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A
Terminal block X50 – checkback contact "main/circuit breaker closed"
Designation
1 NO
2 NC
3 COM
DANGER
1)
Max. switching voltage: 250 V AC
Max. switching capacity: 250 VA
Required minimum load: ≥ 1mA
Electrical installation
4.9 Other connections
Technical specifications
Max. load current: 10 A
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