Timers
Delay on Release
Types B 128, B 121
• Time ranges: 0.15 s to 60 s
• Automatic start after drop out of power supply
• Knob-adjustable time within range
• Repeatability deviation: ≤ 1%
• Output: 10 A SPDT relay
• Plug-in type module
• Scantimer housing
• LED-indication for supply on
• AC or DC power supply
Product Description
Ordering Key
Function
Output
Type
Power supply
Time range
B 128 220 006
Mono-function, plug-in, delay used to switch on an exhaust
on release, miniature time re- fan and keep it running for a
lays up to 60 s covering 2 certain period of time after
individual time ranges. These disconnection of power sup-
economical timers are often ply.
Type Selection
Plug
Output Time ranges
Supply: 24 VAC
Supply: 120 VAC
Supply: 220 VAC Supply: 24 VDC
Circular
8 pins
SPDT
SPDT
0.15 - 6 s
1.5 - 60 s
B 128 024 006
B 128 024 060
B 128 120 006
B 128 120 060
B 128 220 006
B 128 220 060
B 128 724 006
B 128 724 060
Circular
11 pins
0.15 - 6 s
1.5 - 60 s
B 121 024 006
B 121 024 060
B 121 120 006
B 121 120 060
B 121 220 006
B 121 220 060
B 121 724 006
B 121 724 060
Time Specifications
Output Specifications
Output
SPDT relay
250 VAC (rms)
(contact/electronics)
Time ranges
0.15 -
1.5
6 s
60 s
Basic electrical insulation
-
Time range accuracy
0 to +20% on max.
min. actual time ≤ min.
set time
Contact ratings (AgCdO)
Resistive loads
µ (micro gap)
AC 1
DC 1
or
10 A/250VAC (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 106 operations
Repeatability deviation
Time variation
Within rated power supply
and ambient temperature
≤ 1%
Small inductive loads AC 15
DC 13
≤ 0.05%/V
≤ 0.2%/°C
Mechanical life
Electrical life
Reset
Time and/or relay
Power supply interruption
≥ 500 ms
AC 1
≥ 2.5 x 105 operations
(at max. load)
Operating frequency
≤ 7200 operations/h
Insulation voltages
Rated insulation voltage
≥ 2.0 kVAC (rms) (cont./elec.)
Rated transient protection volt. 4 kV (1.2/50 µs) (cont./elec.)
(IEC 60664)
Specifications are subject to change without notice (25.10.99)
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