Specifications are subject to change without notice
1
Current and Voltage Controls
AC monitoring relay for upper and lower
voltage control
Measures on own AC power supply
Measuring range: 20 - 260 VAC
Upper and lower limits separately adjustable
Built-in adjustable timer function
Output: 10 A SPDT relay
Plug-in type module
S-housing
LED-indication for power supply and output ON
Product Description
1-phase knob-adjustable up-
per and lower voltage plug-in
monitoring relay. Built-in time
delay function prevents reac-
tion to sudden voltage peaks.
Often used in applications
where the mains has to be
controlled within a set volt-
age range.
Housing
Type
Output
Power supply
Ordering Key
Type Selection
Plug
Output
Supply: 24 VAC
Supply: 120 VAC
Supply: 220 VAC
Circular
SPDT
S 177 156 024
S 177 156 120
S 177 156 220
Input Specifications
Input
Through pins 2 & 10
Supply voltage
Measuring ranges
Type
Range
Lower
Upper
(VAC)
limit
limit
S .77 024
20- 28
20-23.5 24.5-28
S .77 120
100-140 100-118
122-140
S .77 220
180-260 180-217
223-260
measuring range equals
rms-value of a sinusoidal
voltage, measures on own
supply
Output
SPDT relay
Rated insulation voltage
250 VAC (rms)
(cont./elect.)
Contact ratings (AgCdO)
(micro gap)
Resistive loads
AC 1
10 A/250 VAC (2500 VA)
DC 1
1 A/250 VDC (250 W)
or
10 A/25 VDC (250 W)
Small inductive loads AC 15
2.5 A/230 VAC
DC 13
5 A/24 VDC
Mechanical life
30 x 10
6
operations
Electrical life
AC 1
2.5 x 10
5
operations
(at max. load)
Operating frequency
7200 operations/h
Dielectric strength
Dielectric voltage
2 kVAC (rms) (cont./elect.)
Rated impulse withstand volt. 4 kV (1.2/50 s) (cont./elect.)
(IEC 60664)
Power supply AC types
Overvoltage cat. III (IEC 60664)
Rated operational voltage
(IEC 60038)
Through pins 2 & 10
024
20- 28 VAC, 45 to 65 Hz
120
100-140 VAC, 45 to 65 Hz
220
180-260 VAC, 45 to 65 Hz
Voltage interruption
40 ms
Dielectric voltage
None (supply/elect.)
Rated impulse withstand volt. 4 kV (1.2/50 s) (line/neutral),
direct connection to elect.
Rated operational power
5 VA
1-Phase Max. and Min. Voltage Control
Type S 177
Output Specifications
Supply Specifications
S 177 156 220
2
Specifications are subject to change without notice
S 177
Power ON delay (t
d
)
6 s 2 s
Reaction time
= 1.2 s, worst case reac-
tion time may be up to 5 x
Adjustable delay on release
built-in (0.15s - 10s)
Accuracy
OFF delay
10s, -1/+3 s on max.
< 0.1 s on min.
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
2 (IEC 60664)
Operating temperature
-20 to +50C (-4 to +122F)
Storage temperature
-50 to +85C (-58 to +185F)
Weight
200 g
Approvals
UL, CSA
S 177 measures the average
of its own sinusoidal power
supply. The two set points,
calibrated to rms-value, are
set on upper or middle poten-
tiometer.
The relay operates as long as
the value of the measured
power supply lies within the
Mode of Operation
separately adjustable upper
and lower limits.
The relay releases with an
adjustable time delay of 0.15
to 10 s when the value of the
measured power supply is
above the upper limit or be-
low the lower limit.
Wiring Diagram
Operation Diagram
td = Power-ON delay
t = Time (delay on release)
Upper limit
Hysteresis
Lower limit
Hysteresis
Relay ON
Time/Range Setting
Time
Delay on release, adjustable
0.15 to 10 s.
However, the delay on release
will never be of shorter dura-
tion than the reaction time.
Hysteresis
Hysteresis in relation to meas-
uring voltage is approx. - 2%
for upper limit and approx. +
2% for lower limit.
Sockets
S 411
Hold down spring
HF
Mounting rack
SM 13
Socket covers
BB 4
Front mounting bezel
FRS 2
Potentiometer lock
PL 2
For further information refer to "Accessories".
Accessories
(+) (-)
Power supply
S 177 156
Range setting
Upper potentiometer:
Setting of upper limit on ab-
solute scale in volts.
Middle potentiometer:
Setting of lower limit on ab-
solute scale in volts.
Time setting
Bottom potentiometer:
Setting of time on relative
scale.
General Specifications
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