True Off-Delay Timers

True Off-Delay Timers are time delay relays designed to maintain their output for a preset period after power is removed entirely. Unlike standard off-delay timers that require a control signal, true off-delay models operate independently of control voltage, relying on stored energy to complete the timing cycle. This makes them ideal for safety circuits, process cooling, and controlled shutdown applications.

🔧 Technical Highlights:

• Operating Principle: Timing period begins immediately upon power loss, maintaining output until the set delay elapses.
• Supply Range: Wide 12–240 V AC/DC universal input.
• Time Range: Adjustable from fractions of a second up to several minutes, depending on model.
• Outputs: SPCO or DPCO relay contacts rated for inductive loads (AC-15/DC-13).
• Energy Storage: Internal capacitor or electronic circuit ensures timing after full power removal.
• Indicators: LED indication for power, timing, and relay state.
• Mounting: 35 mm DIN rail or panel mounting options.
• Certifications: CE and RoHS; selected models UL/CSA approved.

✅ Benefits:

• Ensures controlled shutdown timing even during complete power loss.
• Ideal for post-power-off cooling fans, exhausts, and safety delay circuits.
• Universal supply compatibility simplifies design and inventory.
• Compact, reliable design with high electrical endurance.
• Maintains load operation briefly to prevent process interruption or damage.

🚀 Applications:

• Fan or pump overrun control after power-down.
• Controlled cooling or purge cycles in industrial machinery.
• Power-off safety delay for lighting or automation panels.
• Residual energy management in control systems.
• Process and motor control requiring delayed shutdown.

True off-delay timers provide dependable power-off delay control where timing must continue even after mains power is removed, ensuring safe and predictable shutdown sequences.

Related Timing Categories

• Off-Delay Timers
• On-Delay Timers
• Multi-Function Timers
• Run-Back Timers

FAQs

• Q: How does a true off-delay timer differ from a standard off-delay timer?
  A: A true off-delay timer continues timing after full power loss using stored energy, whereas a standard off-delay requires control power to remain present during the delay period.
• Q: What are common uses for true off-delay timers?
  A: They are used for post-power-down cooling, ventilation, or purge operations where systems must continue briefly after mains power is disconnected.