Current and Voltage Controls
1-Phase Frequency Control
Types SF 110, SF 125
• Frequency control relay
• Fixed bandwidth, 6 or 10 Hz (SF 110) or
knob-adjustable bandwidth (SF 125)
• Quartz-controlled digital circuit (SF 125)
• Centre frequency: 50 or 60 Hz
• Output: 10 A SPDT relay
• Plug-in type module
• S-housing
• LED-indication for output ON
• AC power supply, 50 or 60 Hz
SF 110
Product Description
1-phase plug-in frequency
control relays with fixed as
well as adjustable bandwidth.
Often used in connection with
generator equipment.
Ordering Key
Housing
Function
Output
Type
Power supply
Centre frequency
Bandwidth
SF 110 024 50/6
Type Selection
Plug
Output
Centre frequency Bandwidth
50 Hz
50 Hz
50 Hz
50 Hz
60 Hz
60 Hz
60 Hz
60 Hz
6 Hz
10 Hz
1, 3, 5 Hz
2, 4, 6 Hz
6 Hz
10 Hz
1, 3, 5 Hz
2, 4, 6 Hz
Supply: 24 VAC
SF 110 024 50/6
SF 110 024 50/10
SF 125 024 50/5
SF 125 024 50/6
SF 110 024 60/6
SF 110 024 60/10
SF 125 024 60/5
SF 125 024 60/6
Supply: 115 VAC
SF 110 115 50/6
SF 110 115 50/10
SF 125 115 50/5
SF 125 115 50/6
SF 110 115 60/6
SF 110 115 60/10
SF 125 115 60/5
SF 125 115 60/6
Supply: 230 VAC
SF 110 230 50/6
SF 110 230 50/10
SF 125 230 50/5
SF 125 230 50/6
SF 110 230 60/6
SF 110 230 60/10
SF 125 230 60/5
SF 125 230 60/6
Circular SPDT
Input Specifications
Input
Pin 2 & 10
Centre frequency
Bandwidth
or
2, 4, 6 Hz
± 0.02 Hz
Supply voltage
measures on own supply
50 or 60 Hz
Fixed (SF 110): 6 or 10 Hz
± 0.5 Hz
Adjust. (SF 125):1, 3, 5 Hz
Supply Specifications
Power supply AC types
Rated operational voltage
Through pins 2 & 6
024
115
230
Voltage interruption
Dielectric voltage
Rated impulse withstand volt.
Overvoltage cat. III (IEC 60664)
(IEC 60038)
24 VAC ± 15%, 50 or 60 Hz
115 VAC ± 15%, 50 or 60 Hz
230 VAC ± 15%, 50 or 60 Hz
≤40
ms
2 kVAC (rms) (supply/elect.)
4 kV (1.2/50 µs) (line/neutral,
line/line), direct connection
to electronics
2.5 VA
1.5 W
Rated operational power
AC supply
DC supply
Specifications are subject to change without notice (25.10.99)
1
SF 110, SF 125
Output Specifications
Output
Rated insulation voltage
Contact ratings
(AgCdO)
Resistive loads
AC 1
DC 1
or
Small inductive loads AC 15
DC 13
Mechanical life
Electrical life
AC 1
SPDT relay
250 VAC (rms)
(cont./elect.)
µ (micro gap)
10 A/250 VAC (2500 VA)
1 A/250 VDC (250 W)
10 A/25 VDC (250 W)
2.5 A/230 VAC
5 A/24 VDC
≥
30 x 10
6
operations
≥
2.5 x 10
5
operations
(at max. load)
≤
7200 operations/h
General Specifications
Reaction time
SF 110:
SF 125:
Indication for
Output ON
Environment
Degree of protection
Pollution degree
Operating temperature
Storage temperature
Weight
Approvals
Relay operates:
τ
= 0.1 s
Relay releases:
τ
= 1 s
max. 2.5 s
LED, red
(IEC 60947-1)
IP 20 B (IEC 60529)
2 (IEC 60664)
-20° to +50°C (-4° to +122°F)
-50° to +85°C (-58° to +185°F)
200 g
UL, CSA
Operating frequency
Dielectric strength
≥
2.0 kVAC (rms) (cont./elect.)
Dielectric voltage
Rated impulse withstand volt. 4 kV (1.2/50 µs) (cont./elect.)
(IEC 60664)
Mode of Operation
SF 110
The relay monitors that the
frequency of the power sup-
ply - 50 or 60 Hz nominally - is
kept within a fixed tolerance.
The tolerance has a value of
± 3 Hz (± 5 Hz), which equals a
fixed bandwidth of 6 Hz (10 Hz).
As long as the frequency of
the power supply is kept with-
in the limits, e.g. 47 to 53 Hz,
± 0.5 Hz, the relay will be in
operating position, otherwise
it will release.
SF 125
The relay monitors that the
frequency of the power sup-
ply - 50 or 60 Hz nominally - is
kept within certain prese-
lected tolerances.
The bandwidth, which is set
on the potentiometer at the
front of the relay, is 1, 3, 5 or
2, 4, 6 Hz, equaling the below
tolerances:
Frequency
1 Hz
3 Hz
5 Hz
2 Hz
4 Hz
6 Hz
As long as the
Tolerance
± 0.5 Hz
± 1.5 Hz
± 2.5 Hz
± 1 Hz
± 2 Hz
± 3 Hz
frequency of
the power supply is kept
within the limits, e.g. 49 to 51
Hz, ± 0.01 Hz, the relay will be
in operating position.
The relay responds within 1 s.
The delay is due to the fact
that the measuring principle is
a digital counting of the half
cycles on a quartz-controlled
base time of 1 s.
Operation Diagram
fc - {
0.5 - 1.5 - 2.5 Hz
1 - 2 - 3 Hz
Centre frequency (fc)
-
- 2.5
fc - { 0.5 2 1.5 Hz Hz
1- -3
Relay ON
Power supply
Wiring Diagram
Accessories
Sockets◊
Hold down spring◊
Mounting rack
Socket covers
Front mounting bezel
S 411
HF
SM 13
BB 4
FRS 2
Range Setting
Bandwidth setting (SF 125)
The bandwidth is set by built-
in potentiometer at the front
of the housing.
Hysteresis
SF 110: < 1% of centre fre-
quency.
For further information refer to "Accessories".
Power supply
SF 110, SF 125
2
Specifications are subject to change without notice (25.10.99)
