Name: QMV TDR12V4 6-30 VDC SPDT 0.1 seconds to 999 Minutes Adjustable Time Delay On or Off Relay with looping
Brand: Quality Mobile Video
SKU: TDR12V4
Price: 10.99 USD
Availability: InStock

Description

Unit includes: 12 volt time delay relay

QMV TDR12V4 6-30 VDC SPDT 0.1 seconds to 999 Minutes Adjustable Time Delay On or Off Relay with looping

Features:

0.13 seconds to 60 Minutes delay turn on or off mini relay
Circuit board design with dual LED's
Relay will operate on a wide spectrum of voltage from 6 volts to 30 volts DC
Supports micro USB 5.0V power supply
Adjustable time delay turn on from 0.13 seconds to 60 Minutes with push buttons and LCD display
Reverse polarity protection
Relay resets once power is removed
4-button controls for setting on operating time delay with emergency stop function
3.0 Volt - 24 Volt triggered inputs have optocoupler isolation to prevent dc ground issues or short circuits
10 amp / 15 amp rated contacts
SPDT - Single pole Dual throw
Non-volatile memory - After the relay is powered down, all parameter settings are not lost
Power consumption @ 12Vdc 20 mA idle, 50 mA operating
Screw terminals for easy connections up to 14 gauge wire
Dimensions 1-1/2" (W) x 2-1/2" (L) x 3/4" (H) with terminals

Contact configuration:

GND - Ground all-time, as this is what grounds the circuit on the relay
VCC - 12 volt positive connection to trigger the relay
COM - Common latching relay connection (Can be positive or negative depending on your need)
NO - Normally open contact (Connects to common when relay latches)
NC - Normally closed contact (Connects to common when relay is un-energized or at rest)

Uses:

Low voltage trigger: input will trigger with as little as 3 volts
Delayed turn onPrevent high current components from switching on during vehicle start (up to 999 minute delay)
Delayed Voltage inverter:
Looping timer: Trigger a pump to run for 5 minutes every 2 minutes for a certain amount of cycles or infinite while relay is powered
Delayed turn off: Trigger a a device to turn off 5 minutes after a trigger is sent

Operating Modes:

P1.1 - Requires trigger to initiate timer for OP time setting, then shuts down. Re-triggering will not trigger again until power it removed (Time delay off with NO and NC contacts)
P1.2 - Requires trigger to initiate timer for OP time setting, then shuts down. Re-triggering will trigger again for OP time setting (Time delay off with NO and NC contacts)
P1.3 - Requires trigger to initiate timer for OP time setting, then shuts down. Re-triggering will cause relay to stop timer and reset (Time delay off with NO and NC contacts)
P1.4 -
P2.1 -
P2.2 -
P3.1 - Requires trigger to initiate timer for time delay on, OP time setting is the delay, relay turns off after CL time. Re-triggering will cause relay to stop timer and reset. LOP cycles can be set for this mode (Time delay on with NO and NC contacts)
P3.2 - No trigger required to initiate timer for time delay on, OP time setting is the delay, relay turns off after CL time. LOP cycles can be set for this mode (Time delay on with NO and NC contacts)
P-4 - Signal hold function. If trigger is present the relay remains on, when trigger is removed the relay stays latched for OP time. Re-triggering will cause relay to stop timer and reset. (Signal hold on with delayed off - NO and NC contacts)

Legend:

OP - On time
CL - Off time
LP - Loop (Total number of cycles)

Timing range:

XXX. Decimal point is in one place, timing range: 1 second to 999 seconds
XX.X decimal point in ten, timing range: 0.1 seconds to 99.9 seconds
X.X.X. The decimal point is fully illuminated, the timing range is from 1 minute to 999 minutes

Instructions:

Determine what mode is required for your application
According to the working mode of the relay, in the main interface (when the module is powered on, it will flash the current working mode (default P1.1 mode), then enter the main interface "press and hold the SET button for 2 seconds and then release" to enter the mode selection.
You can select the appropriate mode by selecting the mode to be set P1.1 - P-4 by short pressing the UP and DOWN buttons.
Press the SET button to set the mode.
Display will flash OP ON time, CL OFF time, LOP cycle number “---” means unlimited.
To adjust OP/CL/LOP time use the UP, DOWN to adjust the time value.Buttons support long press (rapid increase or decrease) and short press (increase or decrease 1 unit)
Select the decimal point position by short pressing the STOP button, select Timing range (corresponding time 0.1 seconds to 999 minutes); short press the SET button to set the next parameter of the current mode, the process is the same as above.
After setting the parameters of the selected mode, press and hold the SET button for 2 seconds to release, the currently set mode will flash, then return to the main interface and set the parameters successfully.
Main interface: “000” (no decimal point) is displayed when the relay is not working, and the decimal point is clear when the relay is working.
Mode selection interface: long press SET button to enter, after setting is completed, long press SET button to exit, return to the main interface

Specifications

More Information
Manufacturer	Quality Mobile Video
Part Number	TDR12V4
Relay type	PCB relay
California Proposition 65
Return period	30 days
Exchange period	30 days

Reviews

Relay Wiring

Relay Pinout Diagrams Explained

A relay pinout diagram shows the function of each terminal (pin) on a relay and how the internal connections work. It helps you wire the relay correctly for your project.

1. Basic Relay Anatomy

Most automotive relays have two main parts:

Coil – An electromagnet that switches the relay on/off (low current side)
Switch Contacts – The high-current switch that turns your accessory on/off

2. Most Common Automotive Relay: 5-Pin SPDT

This is the standard relay type used with sockets like BRSCN, BRSPC, BRSS, etc.

Pin	Name	Function
30	Common	Power input (goes to the load)
87	Normally Open (NO)	Closed when relay is energized (ON)
87a	Normally Closed (NC)	Closed when relay is de-energized (OFF)
85	Coil Ground	Negative side of coil
86	Coil Positive	Positive side of coil (+12V trigger)

Visual Pinout Diagram

          87
          │
   87a ───┼─── 30
          │
         [Relay]

   85 ───────── 86

How It Works:

No power to 85/86 → Current flows between 30 and 87a
+12V applied to 85/86 → Coil energizes → Current flows between 30 and 87

4. How to Read a Relay Pinout Diagram

Most relay pinout diagrams include the following elements:

A box or outline representing the relay body
Pin numbers clearly labeled next to each terminal
Internal connections shown with lines or dotted lines
Coil symbol (usually a rectangle or spring-like coil)
Switch contacts shown with an arrow indicating movement when the relay is energized

Example Relay Pinout Diagram:

       87          30
        │           │
        └──────┬────┘
               │
             ┌──┐     ← Moving Contact
             └──┘
            /     \
          87a      (Switches when coil is energized)

    85 ───────────── 86
          Coil

Understanding the Symbols:

30 — Common terminal (input power)
87 — Normally Open (NO) contact
87a — Normally Closed (NC) contact
85 & 86 — Coil terminals (control side)

When the relay coil is energized (pins 85/86 powered), the internal switch moves from 87a to 87.

Quick Wiring Examples (5-Pin Relay)

1. Basic On/Off Circuit (Most Common)

Used for lights, fans, fuel pumps, horns, etc.

86 → Switched +12V (from switch, toggle, or ECU output)
85 → Ground (or switched ground)
30 → Constant +12V Power (from battery or fuse box)
87 → Output to Accessory (lights, fan, etc.)
87a → Not used (leave disconnected)

2. Changeover / Dual Circuit Setup

Use both 87 and 87a when you need to switch between two different circuits.

30 → Input Power
87 → Circuit A (ON when relay is energized)
87a → Circuit B (ON when relay is OFF)
85 & 86 → Coil control

3. Typical Pin Connections Summary

Pin	Connection	Typical Wire Color	Purpose
30	Constant +12V	Black (BRS14E & BRS12E)	Power Input
87	To Accessory	Green (BRS14E & BRS12E)	Power Output (ON)
87a	Optional 2nd Circuit	Blue (BRS14E & BRS12E)	Power Output (OFF)
85	Ground	White (BRS14E & BRS12E)	Coil Negative
86	Switched +12V	Red (BRS14E & BRS12E)	Coil Positive

Tip: Always use a fused power source on pin 30 for safety.

Basic 5-Pin Relay Wiring Harness

Battery +12V ──► [Fuse] ──► Pin 30 (Common)

Pin 87 ──► Accessory (Lights / Fan / Pump / Amp etc.)

Pin 86 ──► Switched +12V Trigger
               (from switch, headlight wire, remote turn-on, etc.)

Pin 85 ──► Ground

Pin 87a ──► (Optional - Not used in basic setup)

Recommended Wiring (Empty relay socket or spade connectors (Not BRS14E & BRS12E):

Pin 30 — Red wire with inline fuse (closest to battery)
Pin 87 — Red or Blue wire to device
Pin 86 — White or Pink trigger wire
Pin 85 — Black ground wire

Dual Output (Changeover) Relay Harness

Pin 30   → Constant +12V (Fused)

Pin 87   → Circuit A (ON when relay activated)
Pin 87a  → Circuit B (ON when relay is off)

Pin 86   → Trigger +12V
Pin 85   → Ground

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