Solid-State Repeat Cycle Timers, TBKA Miniature Timers, Airotronics, Airotronics,


Solid-State Repeat Cycle Timers - TBKA Miniature Timers

Solid-State Repeat Cycle Timers - TBKA Miniature Timers
TBKA Miniature Timers

TBKA timers are solid-state output units with digital timing and come in a 15/8" square case. They are available only for 8-40 VDC.

Ease of installation and hook-up is a primary design benefit. All models with integral time adjustment knob or factory-fixed time require only three connections.


Timing Mode

Application of input voltage to the timer starts the “On” time delay. At the end of the “On” time delay, the “Off” time delay starts. At the end of the “Off” time delay, the load is again energized, the timer returns to the “On” time delay, and the cycling continues as long as input voltage is applied. Removal of the input voltage resets the timer.

  • Digital timing, solid-state MOSFET output
  • 1 Amp current load handling
  • 10 Amps 100 ms (millisecond) surge handling
  • Wide DC voltage range
  • 1% Repeat accuracy
  • Virtually unlimited time ranges
  • Factory-fixed or variable-timing adjustment
  • Totally encapsulated for protection from harsh environments
  • Single #6 screw mounting through center mounting hole
  • Standard 6.35mm (.250") quick connect blade terminals
  • 100% Operational testing before shipping


Repeat Accuracy: 0.1% under fixed conditions

Timing Ranges: 0.1 sec. to 24 hours (1 sec., 10 sec., 100 sec., and 1000 secs. are standard.) Special time ranges available upon request

Reset/Recycle Time: 100 milliseconds

Tolerances: Fixed:

  • 10% of nominal time (optional: – 5%, 1%)
  • Variable: -0%, +15%
  • Limit: -10% at minimum time

Recycle Effect: None

Temperature Ranges:

  • Storage: -40° C to +85° C
  • Operating: -25° C to +85° C

Life Expectancy:

  • No predictable failure if used with operating parameters


  • Polarity Protection: All DC units have reverse polarity protection
  • Transient Protection: 18 joules
  • Dielectric Strength: 1800V RMS 60 Hz

Power Requirement: .25 watts max.

Weight: 3 oz. (85g) maximum

Solid-State Output: SPST (N.C.)

Load Current:

  • 1 amp continuous, 10 amps
  • 100 ms surge

Time Cycle Interrupt: Resets timer to original state
(Input Voltage Break)

Mode of Operation Series Input Voltage Time Ranges Time Adjustment Method
Cycle On/Off
TBKA 4. 8-40 VDC

    0001 .1 to 1 sec.
    0010 .1 to 10 sec.
    0100 1 to 100 sec.
    1000 10 to 1000 sec.
Any range up to 24 hours available on special order.

Specify in seconds (S) or hours (H)
  • 400S is 400 seconds
  • 05H5 is 5.5 hours

A. Variable integral, knob on timer

B. Fixed, internal, factory set

Site Design: Process Controls And Instrumentation