Timer Relays & Time Delay Relays | On & Off Delay Timers
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    Timer Relays

    A Timer Relay is a control relay with a time delay function built in. They serve as a combination of an electromechanical output relay and a control circuit, in which contacts can be opened or closed before or after a pre-selected timed interval. Relays can be normally open or normally closed and can be used to delay timed functions from milliseconds to hours or even days.

    Timer Relays are triggered/initiated by either:

    • Voltage being applied or
    • The closing or opening of a trigger signal

    How Does a Timer Relay Work?

    Timer relays operate by incorporating a time-delay function into a standard relay mechanism. When an electrical signal is applied to the timer relay, it activates an internal timing circuit that controls the relay's contacts.

    Depending on the type of timer relay, such as delay on timer or off delay timer, the contacts will either open or close after a predetermined time interval. This delay function allows for precise control in various applications, including automation and process control.

    Timer relays are programmable and can be set for specific time intervals, ranging from milliseconds to several hours, and are available in different voltage ratings, such as 12V, 24V, and 240V, to suit different system requirements.

    Timer Relay or Electromechanical Relay?

    The difference between a timer relay and an electromechanical relay lies in how the output contacts open or close. In a conventional control relay, the contacts open or close immediately when a voltage is applied to or removed from the coil. However, for timer relays, the contacts open or close before or after a specified time period. When choosing the right timer relay, it is important to consider the type of delay required for your application.

    What are the Types of Timer Relays?

    The most common timing function of Delay Relay are:

    • On Delay (Time delay starts on the application of voltage)
    • Off Delay (When a voltage is applied the relay is ready to accept a trigger)
    • Single Shot (One-shot)
    • Interval On (Interval) and Flasher (On First / Off First)
    • Repeat Cycle (When a voltage is applied the relay contacts change state and the timer starts)

    When designing your application, it is important to understand the difference between the types of the Timer Delay Relays, considering what should initiate the delay and if it should start at the same time as the application, as well as when the voltage is released.

    Industrial Applications of Timer Relays

    Delay Relays are typically used in industrial applications and OEM equipment play an important role for many industrial processes such as small panel or sub-panels requirements.

    Lighting circuits

    Timer relays are used in lighting circuits to control the timing of lights turning on and off. For example, a countdown timer relay can be programmed to turn off warehouse lights after a set period, conserving energy and reducing costs when the area is unoccupied. Additionally, an electronic timer relay can be used in outdoor lighting to turn lights on at dusk and off at dawn, ensuring consistent lighting without manual intervention.

    Motor start control

    In motor start control applications, timer relays ensure a delayed start to prevent sudden inrush currents that can damage motors. For instance, a delay on timer relay is used to sequence the startup of multiple motors in a manufacturing line, reducing the load on the electrical system. A 12v timer relay can be utilised in smaller motor applications, providing precise control in compact setups.

    Sensitive equipment

    Timer relays protect sensitive equipment by providing delayed activation or deactivation. For example, an off delay timer relay can be used to keep cooling fans running for a set period after equipment is shut down, ensuring adequate cooling and preventing overheating. A timer relay switch can also be employed to gradually power down sensitive laboratory equipment, minimising wear and tear.

    Safety control

    In safety control systems, timer relays are used to ensure proper timing sequences for safety protocols. For example, a repeat cycle timer can intermittently activate alarms or warning lights in hazardous areas, ensuring continuous safety alerts without manual intervention. An off delay relay can be used to maintain emergency lighting for a set period after a power outage, enhancing workplace safety.

    Conveyor belt sequence delay

    Timer relays are essential in conveyor belt systems to control the sequence of operations. For example, a programmable timer relay can be set to start and stop different sections of a conveyor belt in a predetermined sequence, ensuring smooth material handling and preventing jams or overloads. A cycle timer relay can also be used to synchronise the operation of multiple conveyor belts, optimising the flow of materials through a production line.

    How to Order Timer Relays from RS

    RS is a trusted supplier and distributor of timer relays, offering a comprehensive range of high-quality products from leading brands such as RS PRO, ABB, Omron, Schneider Electric. Our extensive selection ensures that you can find the perfect timer relay for your specific application needs.

    To place an order, simply browse the RS website and use the filter options to narrow down your choices based on your requirements. You can filter by brand to find products from your preferred manufacturers, or select the appropriate supply voltage, from 12V timer relay to 24V timer relay, 240V timer relay and more.

    Filter options also include mounting type, such as DIN rail or panel mount, and timer functions like delay on timer, off delay timer, pulse timer relay, or programmable timer relay. You can also specify the mode of operation, including on-off cycling, delay on break, and repeat cycle functions, to ensure you get the exact functionality you need.

    Once you’ve found your desired timer relay, add it to your cart and proceed to checkout. RS ensures a smooth and efficient ordering experience, providing reliable timer relays for all your industrial and commercial applications.

    **Delivery Information for Australia **

    For efficient delivery of our timer relay and other products across Australia, we recommend placing your orders by 5 pm AEST on weekdays. RS provides next-business-day delivery for products available in our local inventory.

    However, please note that deliveries to some remote areas might take longer. To explore our full range of delivery services, which include expedited same-day delivery and options for consolidated shipments, please refer to our delivery information page for detailed guidance

    936 Products showing for Timer Relays

    RS PRO
    230V ac
    Plug In
    ON Delay
    0.5 → 10s
    2
    Single
    DPDT
    Seconds
    5A
    230V ac
    DPDT
    8-Pin Connector
    -
    -
    21.5mm
    -
    -
    2.8mm
    53mm
    -
    -
    -
    RS PRO
    230V ac
    Plug In
    ON Delay
    1 → 30s
    4
    Single
    4PDT
    Seconds
    3A
    230V ac
    4PDT
    14-Pin Connector
    -
    -
    21.5mm
    -
    -
    2.8mm
    53mm
    +55°C
    -
    -
    RS PRO
    24 → 240V ac/dc
    DIN Rail
    Multifunction
    0.1 s → 120days
    1
    Multi Function
    SPDT
    Seconds
    5A
    240V ac/dc
    DPDT
    Screw
    24V ac/dc
    External
    22.5mm
    -
    -
    100.5mm
    75mm
    +60°C
    -
    -
    RS PRO
    24V dc
    Plug In
    ON Delay
    2 → 60s
    4
    Single
    4PDT
    Seconds
    3A
    24V dc
    4PDT
    14-Pin Connector
    -
    -
    21.5mm
    -
    -
    2.8mm
    53mm
    +55°C
    -
    -
    RS PRO
    110V ac
    Plug In
    ON Delay
    0.2 → 5min
    2
    Single
    DPDT
    Minutes
    5A
    110V ac
    DPDT
    8-Pin Connector
    -
    -
    21.5mm
    -
    -
    2.8mm
    53mm
    +55°C
    -
    -
    Siemens
    12 → 240V
    DIN Rail
    Star Delta
    0.05 → 360000s
    2
    Multi Function
    DPST
    Seconds
    (dc) 1 A, (ac) 3A
    240V
    2NO
    Screw
    12V
    External
    17.5mm
    -
    -
    67mm
    90.5mm
    +55°C
    -
    7PV15
    Schneider Electric
    110 → 230V ac/dc
    Panel Mount
    -
    0.5 → 10s
    -
    Single
    -
    -
    10A
    230V ac/dc
    -
    Screw
    110V ac/dc
    External
    -
    Yes
    Green Premium
    -
    62mm
    +60°C
    0.01A
    Harmony XB5
    Tele
    110 → 240 V ac, 24V ac/dc
    Plug In
    Flasher Pause First, OFF Delay with Control Contact, ON Delay, ON Delay with Control Contact, Single Shot Leading Edge Voltage Controlled, Single Shot Leading Edge with Control Contact, Single Shot Trailing Ed
    1 s → 30days
    2
    Multi Function
    DPDT
    Days, Hours, Minutes, Seconds
    8A
    240V ac
    -
    Screw
    24 V ac/dc, 110V ac
    External
    67mm
    -
    -
    51mm
    38mm
    +55°C
    -
    K3ZM11
    Carlo Gavazzi
    24 → 230V ac/dc
    DIN Rail
    Delay Power
    0.5 → 10s
    2
    1
    SPST
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Siemens
    24 → 240V
    DIN Rail
    Additive ON Delay with Control Signal, OFF Delay with Control Signal, OFF Delay/Instantaneous with Control Signal, ON Delay, ON Delay/Instantaneous Contact, ON Delay/OFF Delay/Instantaneous with Control Signal
    0.05 s → 100h
    2
    Multi Function
    DPDT
    Hours, Minutes, Seconds
    1A
    -
    -
    Screw
    -
    External
    57mm
    -
    -
    73mm
    45mm
    +60°C
    -
    -
    Tele
    12 → 240V ac/dc
    DIN Rail
    Star Delta Start Up
    0.04 s → 3min
    2
    Single
    DPDT
    Milliseconds, Minutes, Seconds
    8A
    250V ac
    DPDT
    -
    -
    External
    35mm
    -
    -
    65mm
    87mm
    +55°C
    -
    E3ZS20
    Omron
    24 → 230 V ac, 24 → 48V dc
    DIN Rail
    ON Delay
    0.1 s → 120h
    1
    Single
    SPDT
    Hours, Seconds
    5A
    30 V dc, 250V ac
    SPDT
    Screw
    24V ac/dc
    External
    17.5mm
    -
    -
    73mm
    80mm
    +55°C
    -
    H3DS
    Phoenix Contact
    -
    DIN Rail
    Switch ON Delay
    0.1 → 10s
    2
    Single
    SPDT
    Seconds
    -
    30V dc
    SPDT
    Screw
    19.2V dc
    External
    6.2mm
    -
    -
    86mm
    80mm
    +65°C
    -
    ETD-BL-1T-ON- 10S-PT
    Omron
    24V ac
    DIN Rail, Surface Mount
    ON Delay
    1 → 30min
    4
    Single
    4PDT
    Minutes
    5A
    250V ac
    4PDT
    Plug In
    -
    External
    21.5mm
    -
    -
    63mm
    28mm
    +50°C
    -
    H3Y-4
    Crouzet
    12 → 240V ac/dc
    Plug In
    Interval
    0.05 → 1 days, 0.05 → 1 min, 0.05 → 1 h, 0.5 → 10 s, 0.5 → 10 min, 0.5 → 10 days, 0.5 → 10h
    2
    Multi Function
    SPDT
    -
    10A
    240V ac/dc
    SPDT
    11-Pin Connector
    12V ac/dc
    -
    82.31mm
    -
    -
    53mm
    35mm
    +60°C
    -
    PA2R
    ABB
    24 → 240 V ac, 24 → 48V dc
    DIN Rail
    Flash
    0.05 s → 100h
    1
    Single
    SPDT
    Hours, Seconds
    6A
    250V
    SPDT
    Screw
    12V
    External
    17.5mm
    -
    -
    58mm
    70mm
    +60°C
    100mA
    -
    Finder
    230V ac
    Plug In
    Interval, ON Delay, Pulse Delayed, Symmetrical Flasher
    0.05 → 100 s, 3 → 100 min, 5 → 100min
    4
    Multi Function
    4PDT
    Hours, Minutes, Seconds
    7A
    250V ac
    4PDT
    14-Pin Connector
    -
    External
    20.6mm
    -
    -
    27.7mm
    59.5mm
    +60°C
    10A
    85 Series
    Tempatron
    230V ac
    DIN Rail, Panel Mount
    ON Delay Energise
    6 s → 6h
    2
    Single
    DPDT
    Hours, Minutes, Seconds
    5A
    30 V dc, 240V ac
    DPDT
    8-Pin Connector
    -
    External
    48mm
    -
    -
    106mm
    48mm
    +60°C
    -
    TT4801
    Schneider Electric
    240V ac
    Wall Mount
    -
    -
    -
    -
    -
    -
    16A
    240V ac
    -
    -
    220V ac
    -
    148mm
    Yes
    Green Premium
    31mm
    93mm
    +45°C
    1A
    Wiser
    Sensata / Crydom
    12 → 24V ac/dc
    DIN Rail
    Interval
    0.1 s → 100h
    2
    Single
    SPST
    Hours, Minutes, Seconds
    6A
    24V ac/dc
    Solid State
    Screw
    12V ac/dc
    External
    11mm
    -
    -
    83mm
    87.7mm
    +80°C
    2.5mA
    SeriesOneDR
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