2
Specifications are subject to change without notice (25.10.99)
Power ON time
≥ 200 ms
Indication for
Power supply ON
LED, red
Environment
Degree of protection
IP 20 B
Pollution degree
2 (IEC 60664)
Operating temperature
-20° to +50°C (-4° to +122°F)
Storage temperature
-50° to +85°C (-58° to +185°F)
Weight
85 g
Approval
UL, CSA
B 128, B 121
Power supply AC types
Installation cat. III (IEC 60664)
Rated operational voltage
Through pins 2 & 10
220
220 VAC ±15%,
or pins 2 & 7
45 to 65 Hz
120
120 VAC ±15%,
45 to 65 Hz
024
24 VAC ±15%,
45 to 65 Hz
Dropout tolerance
≥ 10 ms
Rated insulation voltage
None
Rated transient protection volt.
4 kV (1.2/50 µs) @ 220 VAC
2.5 kV (1.2/50 µs) @ 120 VAC
800 V (1.2/50 µs) @ 24 VAC
(line/neutral)
Power supply DC type
Installation cat. III (IEC 60664)
Rated operational voltage 724
24 VDC + 15/- 20% (pin 2 pos.)
Rated insulation voltage
None
Rated transient protection volt. 800 V (1.2/50 µs)
Consumption
AC supply
60 mA @ 50 Hz/70 mA @ 60 Hz
DC supply
1 W
Power supply
B 128
Power supply
B 121
SPDT
8 pin
Knob-adjustable on scale in
seconds.
Power supply
Relay on
The relay operates immedi-
ately after power supply is
applied.
When power supply is inter-
rupted, the time period starts
and at the end of the set time
the relay releases.
If power supply is reapplied
before the relay releases, the
time is reset and the relay
remains on.
B 121/B 128 monitor that
power supply is applied. If
power supply is interrupted,
the relay starts e.g. an alarm
(battery driven) after the time
period has expired.
Please note
B 128 and B 121 should not
be operated by pulses shorter
than 500 ms.
Sockets
◊
S 408, S 411
Hold down spring
◊
HF
Mounting rack
SM 13
Socket cover
BB 4
Potentiometer lock
PL 1
For further information refer "Accessories".
Supply Specifications
General Specifications
Mode of Operation
Time Setting
Operation Diagram
Wiring Diagrams
Accessories
SPDT
11 pin
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