B2J0201 Economical Trigger Delay Module

Name: B2J0201 Economical Trigger Delay Module
Brand: DAIDISIKE
SKU: b2j0201-economical-trigger-delay-module
Availability: InStock

Level-triggered delay relay module with jumper-selectable high/low trigger and a 2-30s adjustable delay.

▶ Watch it in action: B2J0201 Trigger Delay Relay Module — Signal-Triggered Timing Demo (High/Low Level Input)

B2J0201 Economical Trigger Delay Module - enclosure with terminal markings alongside the internal relay PCB

🔍 Click to enlarge · 1/6

Technical Specifications

Delay mode	Level-triggered delay (starts on an external trigger signal, not at power-up)
Trigger method	High-level trigger (>2V) or low-level trigger (short to ground), selected by a three-pin header and jumper cap; an on-board trigger button can also start the delay
Delay range	2 - 30 seconds, adjustable via on-board potentiometer (clockwise to increase, counterclockwise to decrease)
Core chip	NE555
Output	Single-channel relay, NO/NC (open-drain transistor output type also available)
Supply voltage (rated)	5V / 9V / 12V / 18V / 24V DC
Supply voltage (normal operating range)	5V DC: 4.8-5.2V; 9V DC: 8.5-11V; 12V DC: 11-14V; 18V DC: 16-20V; 24V DC: 20-28V
Power supply ripple	< 1 Vp-p
Supply current	< 50 mA (typically 40 mA when the relay is made)
Trigger input stress (normal)	High-level selected: DC 0-30V; Low-level selected: DC 0-5V
Output stress (normal)	Relay type: DC 30V or AC 0-220V, 8A; Transistor type: DC 12-48V, 8A
Output isolation voltage (normal)	Relay type: < 250V; Transistor type: < 130V
Operating temperature	-20 to 60 degrees C
Absolute max supply voltage	5V: 5.3V; 9V: 11.5V; 12V: 15V; 18V: 22V; 24V: 30V DC
Self-resettable fuse	DC 30V, 500mA
Absolute max trigger input stress	DC 50V
Absolute max output stress	Relay type: AC 250V, 10A; Transistor type: DC 55V, 10A
Absolute max output isolation voltage	Relay type: DC 1000V, 60s (type test only); Transistor type: DC 250V, 60s (type test only)
Relay mechanical life	> 100,000 operations (> 10,000 under heavy load)
Storage temperature	-40 to 85 degrees C
Electrostatic discharge resistance	IEC 61000-4-2: 1kV on all terminals, module functions normally; 2kV, module not permanently damaged
Electrical fast transient resistance	IEC 61000-4-4: 500V/5kHz/2min on all terminals, module functions normally (delay time may slightly change); 1kV, module not permanently damaged
Surge resistance	IEC 61000-4-5: 1kV to ground on power terminals, module not permanently damaged (guaranteed by design)
Creepage distance	> 9.2mm from relay terminal to logic side (requirement > 6mm), pollution degree 3, material category IIIa/IIIb
Electrical clearance	> 2.2mm from relay terminal to logic side (requirement > 2mm)
PCB dimensions	55mm (L) x 30mm (W), tolerance +/-5%
Mounting hole spacing	49mm (top-bottom) x 24.5mm (left-right)
Terminal spacing	5.08mm

Overview

The B2J0201 is an economical, level-triggered delay relay module for control circuits that must act on an external signal rather than on power-up. Unlike a plain power-on delay module, it carries a dedicated trigger input: after power-up the relay stays open, and it only makes once an external voltage-level signal (or the on-board trigger button) is applied, making it suited to "signal detected -> relay makes -> signal removed -> delayed release" control logic.

It is available in 5V, 9V, 12V, 18V or 24V DC supply versions (M31, 12V DC with relay output, ships by default), with trigger polarity set by a three-pin header and jumper cap for either high-level (>2V) or low-level (short to ground) triggering. Delay time is adjustable from 2 to 30 seconds on an on-board potentiometer, and the single-channel relay output is rated 250V AC / 10A (NO/NC), with an open-drain transistor output version also available for 12-48V DC / 10A inductive loads.

Key Facts — B2J0201 at a glance

The B2J0201 begins its delay only after an external trigger signal or button press is applied; the relay does not start counting down at power-up.
Delay time is adjustable from 2 to 30 seconds via an on-board NE555-based potentiometer circuit, with no programming required.
Trigger polarity is jumper-selectable: high-level trigger fires on a voltage above 2V at the trigger terminal, low-level trigger fires when the terminal is shorted to ground.
The default M31 configuration is a 12V DC supply with a single-channel relay output rated AC 250V / 10A absolute maximum (NO/NC), and relay mechanical life exceeds 100,000 operations.
Supply voltage is available in 5V, 9V, 12V, 18V or 24V DC versions, with supply current under 50mA (typically 40mA when the relay is made).
On a 55 x 30 mm PCB with 5.08mm terminal pitch, creepage from the relay terminals to the logic side measures over 9.2mm against a 6mm requirement, and the trigger input withstands DC 50V absolute maximum.

Features & Benefits

The Relay Waits for a Signal, Not for Power

Terminal 0 is a dedicated trigger input with voltage-threshold detection, so the relay stays open at power-up and no countdown runs until a real signal arrives. That removes the nuisance pulse a power-on delay module gives you every time the panel is switched on, and it means the module can sit permanently powered and armed, reacting only when the sensor speaks.

High or Low Trigger Chosen by Moving One Jumper Cap

Move the cap between "o" and "+" and any positive voltage above 2V at terminal 0 starts the sequence; move it to "o" and "-" and a simple short to ground does the job. One part number therefore accepts a PNP sensor, an NPN sensor, a PLC output, a dry contact or a push button - no rewiring of the field side and no second SKU to stock.

Signal Holds the Relay, Release Starts the Delay

A momentary pulse closes the relay for the set time T; a signal that stays present keeps the relay closed for as long as it lasts and only then times out T before releasing. This is exactly the "stay on while something is there, switch off a while after it leaves" logic that lighting, fans and alarms need, and it comes free in the hardware instead of costing you two PLC rungs and a timer block.

NE555 Timing Core with a Screwdriver-Set 2-30 s Delay

An analogue NE555 core and an on-board potentiometer cover 2 to 30 seconds - clockwise longer, counterclockwise shorter. Setting the delay takes a screwdriver and ten seconds on site: no software, no programming cable, no host computer, and nothing to re-flash if a technician wants 20 s instead of 8 s. The trigger button (No. 6) lets the installer prove the setting on the spot without a signal source.

One Board, Five Supply Voltages, 40 mA Typical

5V, 9V, 12V, 18V or 24V DC versions are selected by the first digit of the [dd] ordering field (M31 = 12V relay output ships by default), with defined windows such as 11-14V for the 12V type and 20-28V for the 24V type. Draw is under 50 mA (typically 40 mA with the relay energised), so the module usually runs off the sensor's own supply rather than needing a dedicated one. Custom supply voltages are available.

Isolated Dry Contact That Switches Mains-Level Loads

The single-channel relay gives both NO and NC contacts rated AC 250V / 10A absolute maximum (AC 0-220V or DC 30V at 8A in normal working conditions), fully isolated from the low-voltage logic - up to DC 1000V for 60s on type test. A 5V sensor circuit can therefore switch a 220V corridor lamp directly, with mechanical life above 100,000 operations.

Details That Show Up Only When Something Goes Wrong

Reverse-polarity and overcurrent protection plus a DC 30V / 500 mA self-resetting fuse cover the wiring mistakes that kill cheap modules. The PCB carries a routed creepage slot measuring over 9.2 mm against the 6 mm requirement (clearance over 2.2 mm against 2 mm) at pollution degree 3, and the trigger input survives DC 50V absolute maximum - so a 24V line accidentally landed on a trigger terminal does not end the job.

Transistor Output Option for Silent, High-Cycle DC Switching

Order the transistor version (second [dd] digit = 2) for an open-drain output rated 12-48V DC / 10A with a built-in 10A freewheeling diode that drives inductive loads such as solenoids and motors directly - no contact wear, no click, no arc. Because the NE555 state can become invalid at power-down and pulse the transistor for around 100 ms, power the module up before the output and down after it.

Applications

Stairwell / Corridor Sound- or Motion-Activated Lighting — A sound or PIR sensor outputs a high-level signal on detection, triggering the relay to switch the light on; once the signal disappears the light stays on for the set delay (about 20 seconds) before switching off, using high-level trigger mode.

Sensor-Triggered Alarm and Indicator Linkage — Door, water-leak or smoke sensors trigger the relay when a signal is detected, and the module resets only after a delay once the signal clears, reducing false or chattering actuations from momentary signals.

Equipment "In-Position" Sequenced Actions — A photoelectric switch or similar sensor triggers the next production-line step when a workpiece arrives, and the delay times out the sequence after the workpiece moves on.

Delayed Load Cutoff on Switch Release — A button or switch triggers the load; releasing it does not cut the load immediately but starts the adjustable delay first, giving a "delayed-off" light or equipment shutdown effect.

Fan / Exhaust Delayed Shutdown — When the main equipment's stop signal arrives, the fan keeps running for the set delay period to finish venting heat or fumes before it is switched off.

Pump, Valve or Solenoid Run-On After a Switch Clears — A level, flow or pressure switch holds the relay closed while its signal is present; when the signal clears, the pump or valve keeps running for the 2-30 second delay before stopping, avoiding the rapid on/off chattering that a bare switch would cause. The transistor output version (12-48V DC / 10A with a freewheeling diode) suits DC solenoids that cycle frequently.

Models & Ordering Information

B2J0201 Ordering Code

B2J0201

Full ordering code format: B2J0201R[b]T[c]M[dd]. [b]/[c] denote main/sub hardware version; in [dd] the first digit sets supply voltage (1=5V, 2=9V, 3=12V, 4=18V, 5=24V) and the second digit sets output type (1=relay, 2=transistor). Default shipped configuration is M31 (12V DC supply, relay output).

How to Select

Choose B2J0201 (level-triggered delay) when the action must be started by an external level signal or button and the trigger polarity needs to be selectable.
If no trigger signal is needed and the output should switch on automatically at power-up, choose the simpler, lower-cost B2J0101 (power-on delay) instead.
If the application needs multiple delay modes, long second/minute/hour delays, high precision, or voltage-threshold sensing, choose the full-featured B2J0601 (universal multi-mode delay) instead.
Use high-level trigger mode for sensors that output a positive voltage above 2V on detection.
Use low-level trigger mode for switches or sensors that pull the trigger terminal to ground on detection.
Select the M31 default (12V DC, relay output) for mains-adapter-powered 220V AC installations such as sound-activated lighting.
Select the transistor output version for frequent triggering or silent switching of 12-48V DC inductive loads, and add power sequencing (module powered up first, then output; output powered down first, then module) since the transistor type can briefly conduct at power-off.
This module is a general-purpose commercial-grade delay relay, not a forcibly-guided safety relay; for strong-interference industrial environments add power/port filters or use an EFT-resistant supply with a cord shorter than 3m.

📘 Need the full method? NPN vs PNP Sensor Outputs Explained

When NOT to specify the B2J0201 — and what to use instead

You want the delay to start automatically at power-up with no external signal

Why not: B2J0201 needs an external trigger or a button press before anything happens. The relay stays open and no countdown runs on power alone.

Use instead: B2J0101, which is a power-up delay and needs no trigger input.

You need edge triggering, cyclic on/off patterns, self-locking behaviour, or minute / hour ranges

Why not: B2J0201 offers one trigger topology only — level trigger, hold then release, on a 2-30 second potentiometer. There are no edge, cyclic or self-locking modes and no time unit beyond seconds.

Use instead: B2J0601, whose 26 modes cover high/low level, rising/falling edge, cyclic and self-locking behaviour across second, minute and hour ranges.

Wiring a 12 V or 24 V level signal into the low-level trigger path

Why not: In low-level trigger mode the trigger input's normal operating stress is DC 0-5 V. The DC 50 V figure is the absolute maximum, not a working level.

Use instead: Use high-level trigger mode instead (rated DC 0-30 V normal), or B2J0601, whose trigger input doubles as a 0-30 V adjustable threshold detector.

Deploying where motors or contactors share the supply

Why not: B2J0201 is tested to IEC 61000-6-1 light-industry levels (500 V EFT), not the 1 kV EFT of IEC 61000-6-2.

Use instead: Add power and port filtering or an EFT-resistant supply with a cord under 3 m, or move to E4J0101, measured at 2 kV EFT.

A safety interlock, emergency-stop or guard-release delay

Why not: Its own selection guide describes it as a general-purpose commercial-grade delay relay, not a forcibly-guided safety relay. It carries no Type / SIL / PL rating.

Use instead: DA31 Emergency-Stop Safety Relay Module or DQSRN Safety Relay Module.

You need to monitor the trigger event or delay status remotely

Why not: B2J0201 has no communication port of any kind. Status is two on-board LEDs; settings are local only, by jumper and potentiometer.

Use instead: B2J0302 for a networked MODBUS point, or E4J0101, which adds TTL / USB connectivity.

Specifications we do not publish yet

We only publish a figure once we are confident it is true. The items below are still being validated through further testing and real-world customer feedback, so for now we would rather leave them open than guess. If one of them matters to your design, ask us for the latest validated status.

Electrical (load-switching) contact life under the rated 8 A load, as distinct from the published mechanical life.
Relay brand and model number.
Ingress protection (IP) rating.
MTBF.
Quantified temperature drift of the delay circuit. The manual notes EFT exposure may shift the delay slightly but gives no figure.
Operating and storage relative humidity range.
Terminal wire gauge and screw torque.
Certification status — the manual states none. Certification documents are available on request.

Frequently Asked Questions

What supply voltages does the B2J0201 trigger delay module support?

The B2J0201 is offered in 5V, 9V, 12V, 18V and 24V DC versions, selected by the supply-voltage digit in the ordering code (the default shipped option is the 12V relay output type, M31). Each version has a defined normal operating window, for example the 12V type operates from 11 to 14V DC, with supply current under 50mA.

How is the delay time adjusted and what is the range?

Delay is set with the on-board potentiometer knob, giving an adjustable range of 2 to 30 seconds. Rotate the knob clockwise to increase the delay and counterclockwise to decrease it. The countdown starts the moment the trigger signal is applied; if the signal persists, the relay stays made until the signal is removed and the delay elapses.

How do I configure high-level versus low-level triggering?

Trigger polarity is set with a three-pin header and a jumper cap. Place the cap between "o" and "+" for high-level trigger, then apply a positive voltage above 2V to the trigger terminal to start the delay. Place it between "o" and "-" for low-level trigger, where shorting the trigger terminal to ground starts the delay. The on-board button can also trigger the sequence.

What happens if the trigger signal is still present when the delay would normally end?

The relay follows the trigger signal, not a fixed timer. As long as the trigger signal is present, the relay stays made; the 2-30 second delay only begins counting down after the trigger signal is removed, and the relay releases when that delay elapses.

What is the difference between the relay output and transistor output versions?

The relay output type switches DC 30V or AC 0-220V up to 8A (10A absolute maximum) through mechanical contacts rated for over 100,000 operations. The transistor (open-drain) type is rated 12-48V DC at 8A (10A absolute maximum) with a freewheeling diode for inductive loads. On power-off the transistor type can briefly conduct, so power sequencing is recommended where momentary pulses would matter.

Does the B2J0201 carry industrial safety or compliance certification?

Certification documents are available on request.