Analog, Solid-State Timers, TDM Timers, Airotronics


Analog Solid-State Timers - TDM Timers

Analog Solid-State Timers
TDM Timers
The TDM Delay on Break units are high performance analog solid-state timers with octal, magnal round and QC bases for plug-in installation. They incorporate relays which can handle up to 10 amp loads in SPDT, DPST and DPDT formats. The metal enclosure provides a high degree of RFI shielding.
Timing Mode

Power is applied to the input terminals of the timer continuously. Upon closure of a normally open (N.O.) external initiate switch the load transfers immediately and remains transferred as long as the external initiate switch is closed. Starting the time delay is deferred by maintained closure of external initiate switch. The time delay is started instantly by opening the initiate switch.

At the end of the delay period, the load de-energizes and the timer is ready for another cycle. Delay time may be reset to beginning, prior to the end of the delay period, by momentarily reclosing (pulsing) the initiate switch.

  • High-performance RC solid-state timing
  • Industrial 10 amp relay, isolated load handling
  • Standard AC voltage range
  • 1% timing accuracy
  • Timing ranges from .2 to 360 seconds standard (special time settings and ranges also available)
  • Factory set or variable-time adjustment
  • Optional remote-time adjustment
  • Standard octal (8 pin), magnal (11 pin) plug-ins or 4.75 mm (.187") blade terminal mountings
  • Metal enclosure provides RFI shielding
  • 100% Operational testing before shipping
Input Voltage: VAC: 24 to 240, 50/60 Hz

Relay Output Contacts: DPDT 10A resistive, 28VDC, 120/240 VAC, HP rated, Gold flashed silver

Repeat Accuracy: ±1% or better within operating voltage and temperature range

Recycle Effects: Negligible. No first cycle or delta effect

Time Range End: At minimum time -15%

Timing Ranges: .2 to 360 seconds in nine ranges

Limit Tolerances: At maximum time +10%. Minimum time delay can be .05 sec

Operating Voltage: ±20% of nameplate voltage

Temperature Ranges:

  • Storage: -40°C + 85°C
  • Operating: -10°C to +65°C
    -40°C operation available
Life Expectancy:
  • Mechanical: Up to 10 million operations
  • Electrical: Life dependent depending on contact full current load
  • Transient Protection: 2000V for 1 millisecond
Power Requirement: 2.5 watts max.

Weight: Approx. 6 oz. (170g)

Dielectric Strength 1800V RMS 60 Hz case to terminals standard

Relay Pull-In Time: Approx. 10 msec after energized

Reset/Recycle Time: 15 msec after power removal

Mode of Operation Series Input Voltage Time Ranges Time Adjust. Method Terminal
Mounting Style
On Break
TDM 1 120 VAC
50/60 Hz

2 230 VAC
50/60 Hz

3 24 VAC
50/60 Hz

8 Special VAC (specify)
VARIABLE TIME PERIODS A Variable integral knob on timer

B Variable external knob remote

C Fixed, internal factory set

D Fixed external resistor remote
1 8 pin roud
octal base

2 11 pin round
magnal base

3A .187 QC blade terminals
plus side bracket

4A .187 QC blade terminals
plus top bracket

5A .187 QC blade terminals
without bracket

BB Base bracket (octal and magnal only)

VCS External initiate switch connected to phase

001 .2 to 1.2 sec.
006 .2 to 6 sec.
015 .2 to 15 sec.
030 .2 to 30 sec.
060 .2 to 60 sec.
120 .2 to 120 sec.
180 .2 to 180 sec.
240 .2 to 240 sec.
360 .2 to 360 sec.
Specify time in full seconds or hours followed by the letter "S" or "H" and the decimal amount of the main time unit and the decimal amount of the main time unit.
Examples: 5S5 is 5.5 secs.

Site Design: Process Controls And Instrumentation