Specifications are subject to change without notice (25.10.99) 1
Timers
Mono-function, plug-in, delay
on release, miniature time re-
lays up to 60 s covering 2
individual time ranges. These
economical timers are often
used to switch on an exhaust
fan and keep it running for a
certain period of time after
disconnection of power sup-
ply.
Plug Output Time ranges Supply: 24 VAC Supply: 120 VAC Supply: 220 VAC Supply: 24 VDC
Circular SPDT 0.15 - 6 s B 128 024 006 B 128 120 006 B 128 220 006 B 128 724 006
8 pins 1.5 - 60 s B 128 024 060 B 128 120 060 B 128 220 060 B 128 724 060
Circular SPDT 0.15 - 6 s B 121 024 006 B 121 120 006 B 121 220 006 B 121 724 006
11 pins 1.5 - 60 s B 121 024 060 B 121 120 060 B 121 220 060 B 121 724 060
Time ranges 0.15 - 6 s
1.5 - 60 s
Time range accuracy 0 to +20% on max.
min. actual time ≤min.
set time
Repeatability deviation ≤1%
Time variation
Within rated power supply ≤0.05%/V
and ambient temperature ≤0.2%/°C
Reset Power supply interruption
Time and/or relay ≥500 ms
Output SPDT relay
Basic electrical insulation 250 VAC (rms)
(contact/electronics)
Contact ratings (AgCdO) µ (micro gap)
Resistive loads AC 1 10 A/250VAC (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 106operations
Electrical life AC 1 ≥2.5 x 105operations
(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)
Function
Output
Type
Power supply
Time range
• 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
Delay on Release
Types B 128, B 121
Ordering Key
Product Description
Type Selection
Time Specifications Output Specifications
B 128 220 006