5
Product description
3
Product description
To correctly identify the product when communicating with Pfeiffer Vacuum, al-
ways have the information from the rating plate available.
3.1 Relay box single-phase, PM 041 937 -T
Fig. 1: Relay box PM 041 937 -T
The relay box PM 041 937 -T with semiconductor relay is provided especially for
the intermittent operation on Pfeiffer Vacuum diaphragm vacuum pumps. The
maximum relay contact load is 5 A.
3.2 Relay box single-phase, PM 041 938 -T
Fig. 2: Relay box PM 041 938 -T
20
Relay box
20a Control lead
20b Connection backing pump PG 9
20c Connection mains power input PG 11
The relay box PM 041 938 -T with mechanical relay is provided for the operation of
larger Pfeiffer Vacuum backing pumps. The maximum relay contact load is 20 A.
20
Relay box
20a Control lead
20b Connection backing pump PG 9
20c Connection mains power input PG 11
20b
20a
20
20c
20b
20a
20
20c
