Level switches are used to monitor the level of fluids in unpres
surized reservoirs. Various versions are available to meet the
different requirements related to the monitoring of fluid levels.
– Switches with one switching point (WS32 …), e.g. ones used
to monitor the minimum level of fluid in a reservoir.
– Switches with two switching points (WS35 …), likewise used
to monitor the minimum level of fluid, an advance warning
being emitted before a critical level is reached and without
having to shut down the machine. Before the second switch
ing point is reached, there is still enough oil in the reservoir for
a shift to be completed without having to stop the machine or
interrupt work.
– Switches with two switching points (WS33 …), e.g. for a mini
mum and maximum level of fluid in the reservoir, automatic
topping up of the reservoir being terminated, for example,
before the maximum level is reached.
Further level switches, e.g. for other fluids like NLGI grades 000
and 00 grease, are available on request (capacitive proximity
switches).

3
1-1702-EN
Group
Contact function /
type of contact
Plug
Electric circuit
Number of
switching point
WS32-2
min. level / 1 changeover contact
connector plug
DIN EN 175301-803-A
cf. diagram (page 2)
1 switching point
WS32-2-V57-A
min. level / 1 changeover contact
circular plug
M12×1
24 V AC / 1 A; 24 VA 1)
48 V DC / 1 A; 40 W 1)
1 switching point
WS32-S30
(with LED)
min. level / 1 changeover contact
circular plug
M12×1
24 V DC / 1 A; 30 W
1 switching point
WS33-2
max. level / 1 NO type
min. level / 1 NC type
connector plug
DIN EN 175301-803-A
cf. diagram (page 2)
2 switching points
WS33-2-V57-A
max. level / 1 NO type
min. level / 1 NC type
circular plug
M12×1
24 V AC / 1 A; 24 VA 1)
48 V DC / 1 A; 40 W 1)
2 switching points
WS33-S30
(with LED)
max. level / 1 NC type
min. level / 1 NC type
circular plug
M12×1
24 V DC / 1 A; 30 W 1)
2 switching points
WS35-2
advance warning / 1 NO type
min. level / 1 NC type
connector plug
DIN EN 175301-803-A
cf. diagram (page 2)
2 switching points
with fixed spacing
approx. 25 mm
WS35-2-V57-A
advance warning / 1 NO type
min. level / 1 NC type
circular plug
M12×1
24 V AC / 1 A; 24 VA 1)
48 V DC / 1 A; 40 W 1)
2 switching points
with fixed spacing
approx. 25 mm
WS35-S30
(with LED)
advance warning / 1 NO type
min. level / 1 NC type
circular plug
M12×1
24 V DC / 1 A; 30 W 1)
2 switching points
with fixed spacing
approx. 25 mm
WS68
Depending on mounting height / 1 NC type
connector plug
DIN EN 175301-803-A
48 V AC/DC
0,25 A; 10 W
1 switching point
1) Risk protective measures to be taken for proper operation: “Functional extra-low voltage with protective separation” (PELV)
Standard: EN 60204-1 / IEC 60204-1
HD 60364-4-41 / DIN VDE 0100-410 / IEC 60364-4-41