2
Specifications are subject to change without notice
SM 170
Reaction time
τ = 0.5 s, worst case reac-
tion time may be up to 5 x
τ
Indication for
Power supply ON
LED, green
Output ON
LED, red
Environment
(IEC 60947-1)
Degree of protection
IP 20 B (IEC 60529)
Pollution degree
(IEC 60664)
1: SM 170 380/400/415
2: SM 170 220
Operating temperature
-20° to +50°C (-4° to +122°F)
Storage temperature
-50° to +85°C (-58° to +185°F)
Weight
200 g
Approvals
UL, CSA, SEV
(SEV only 3 x 220 VAC)
The relay measures on its own
3-phased power supply and
operates when all phases are
present and the phase se-
quence is correct.
Example 1
The relay is for monitoring
that the power supply has a
correct phase sequence and
that all phase voltages are
present. The relay is a 3-phase
power supply monitoring re-
lay.
Example 2
The relay releases in case of
interruption of one of the
phases, provided that the
voltage regenerated by elec-
tric motors on the interupted
Mode of Operation
phase does not exceed 70%
of the nominal voltage. If it
exceeds this value the con-
nection cannot be recom-
mended (see description ex.
3). The regenerated voltage
will be a lower phase voltage
combined with a phase angle
failure.
Example 3
If the value of the regene-
rated voltage is slightly higher
than 70% of the nominal volt-
age, the relay releases when
neutral is connected to pin 11
as sensitivity is improved.
Operation Diagram
Phase L1, pin 5
Phase L2, pin 6
Phase L3, pin 7
Relay ON
Wiring Diagrams
Sockets
◊
S 411
Hold down spring
◊
HF
Mounting rack
SM 13
Socket covers
BB 4
Front mounting bezel
FRS 2
For further information refer to "Accessories".
Accessories
Example 1
Example 2 and 3
General Specifications