A1J0101 Economical Input Amplifier Module

Name: A1J0101 Economical Input Amplifier Module
Brand: DAIDISIKE
SKU: a1j0101-economical-input-amplifier-module
Availability: InStock

Optocoupler-isolated input amplifier that turns a low-voltage signal into a 250V AC / 10A relay output.

▶ Watch it in action: A1J0101 Optocoupler Isolated Input Relay Module — Wiring & Trigger Demo (5-24V DC)

A1J0101 Economical Input Amplifier Module - front view of bare relay PCB with screw terminals

🔍 Click to enlarge · 1/8

Technical Specifications

Type	Optocoupler-isolated input amplifier, relay or transistor output
Supply voltage options	5V / 9V / 12V / 18V / 24V DC (default M31 = 12V relay output)
Supply voltage 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
Supply voltage absolute maximum	5V: DC 5.3V; 9V: DC 11.5V; 12V: DC 15V; 18V: DC 22V; 24V: DC 30V
Power supply ripple	< 1Vp-p
Supply current	< 50mA (typical 40mA when relay is energized)
Self-resettable fuse	DC 30V, 500mA
Input stress (normal)	DC 0-30V
Input stress (absolute maximum)	DC 50V
Input isolating voltage (normal)	< 250V
Input isolating voltage (absolute maximum)	DC 1000V, 60s (type test)
Output stress, relay type (normal)	DC 30V or AC 0-220V, 8A
Output stress, relay type (absolute maximum)	AC 250V, 10A
Output stress, transistor type (normal)	DC 12-48V, 8A
Output stress, transistor type (absolute maximum)	DC 55V, 10A
Output isolating voltage, relay type	< 250V (normal); DC 1000V, 60s (absolute maximum, type test)
Output isolating voltage, transistor type	< 130V (normal); DC 250V, 60s (absolute maximum, type test)
Relay mechanical life	> 100,000 operations (> 10,000 under heavy load)
Operating temperature	-20 to 60°C
Storage temperature	-40 to 85°C
ESD immunity	IEC 61000-4-2: 6kV, discharge on all terminals - module functions normally
EFT immunity	IEC 61000-4-4: 2kV/5kHz/2min - normal operation; 4kV/5kHz/2min - relay may jitter, no permanent damage
Surge immunity	IEC 61000-4-5: 1kV to ground on power terminals - no permanent damage (by design)
Creepage distance	> 6.05mm measured (requirement > 6mm), pollution degree 3, material group IIIa/IIIb
Electrical clearance	> 2.2mm measured (requirement > 2mm)
PCB dimensions	55 x 30mm (tolerance ±5%)
Mounting hole spacing	49mm (vertical) x 24.5mm (horizontal)
Terminal pitch	5.08mm
Optional enclosure dimensions	approx. 35.5 x 60.5 x 22mm
Terminals	7 screw terminals, 1 jumper header, 3 LED indicators

Overview

The A1J0101 is an optocoupler-isolated input amplifier module for industrial control panels and OEM system integrators. It accepts a low-voltage signal on its optocoupler input and drives a single isolated relay output, letting a PLC, sensor, or control signal safely switch a higher-power load without direct electrical contact between the control side and the load side.

Input and output isolation is rated up to 1000V DC (60s type test), while the relay output switches DC 30V or AC 0-220V at 8A under normal operating conditions, with an absolute maximum of AC 250V, 10A. The module accepts 5V, 9V, 12V, 18V or 24V DC supply at under 50mA, and its input trigger polarity (high-level or low-level operation) is selectable with an on-board jumper.

Key Facts — A1J0101 at a glance

Input isolation is rated DC 1000V for 60s (type test); working input isolating voltage is less than 250V.
The relay output switches DC 30V or AC 0-220V at 8A under normal conditions, with an absolute maximum of AC 250V, 10A on both the NO and NC contacts.
Supply current is less than 50mA, typically 40mA with the relay energized, from a 5V, 9V, 12V, 18V or 24V DC supply.
Relay mechanical life exceeds 100,000 operations (more than 10,000 under heavy load).
The module withstands 6kV ESD on all terminals and 2kV/5kHz/2min EFT with normal operation - twice the 1kV EFT level required by IEC 61000-6-2-2016 for basic industrial environments - plus a 1kV surge to ground on the power terminals.
Measured creepage from the relay terminal to the logic side is more than 6.05mm and clearance more than 2.2mm at pollution degree 3, against requirements of 6mm and 2mm.

Features & Benefits

An Isolator and a Power Relay on One 55 x 30mm Board

A DC 1000V (60s type test) optocoupler input and a relay contact rated AC 250V / 10A absolute maximum sit on a single 55 x 30mm PCB with 5.08mm screw terminals. One part number, one set of wiring and one mounting position replace a separate signal isolator plus an interposing relay - the cheapest honest way to get a low-voltage signal to switch a mains-side load.

One Jumper Cap Sets Polarity - or Forces the Relay On or Off

Terminal 7 is a 5-pin header marked V, G, +, - and o. Cap 'o' to '+' for high-level operation (relay makes on signal), or 'o' to '-' for low-level operation, so one stock module suits sourcing and sinking sensors with no redesign; the relay makes whenever 'o' sees more than 2V. Cap 'o' to 'V' or 'G' instead and the relay is held permanently made or broken for commissioning and bypass - and because the V and G pads ship unpopulated and must be soldered, a stray cap cannot defeat your logic in normal use.

One Board, Two Independent Modules When You Need Them

Remove the jumper cap and the optocoupler input and the relay output become two non-interfering functions: a standalone DC 1000V isolated input and a standalone isolated relay output. In a mixed panel that means one board can serve two unrelated circuits, cutting board count and terminal wiring in cost-sensitive volume builds.

EFT Headroom of 2x the Industrial Requirement, and a Fuse You Never Replace

The module runs normally through 2kV/5kHz/2min EFT - twice the 1kV that IEC 61000-6-2-2016 asks of basic industrial equipment - takes 6kV ESD on every terminal, and survives 4kV EFT and a 1kV surge without permanent damage. Reverse-polarity protection and a self-resettable DC 30V / 500mA fuse mean a miswired supply or a brief overload costs you a power cycle, not a site visit with a spare fuse.

Creepage Slots Cut Into the PCB, With Measured Margin

The high-voltage side is separated by creepage slots routed into the PCB: measured creepage from relay terminal to logic side is more than 6.05mm against a 6mm requirement, and clearance more than 2.2mm against 2mm, at pollution degree 3 with material group IIIa/IIIb. The margin is measured on the real board, not just drawn. Certification documents are available on request.

Matches Your Existing DC Rail and Barely Loads It

Five supply versions - 5V, 9V, 12V, 18V and 24V DC, each with its own working window (the 12V type accepts DC 11-14V) - draw less than 50mA, typically 40mA with the relay energized. That is light enough to hang several modules off a small PLC or sensor supply, and custom supply voltages are available. Undesignated orders ship as M31: 12V supply, relay output.

Three LEDs and Both Contacts Make Commissioning Fast

A green power LED, a yellow input LED and a blue action LED let you tell 'no supply' from 'no signal' from 'relay not pulling in' at a glance, without a meter. NO and NC are both brought out to screw terminals, so a break-on-signal function needs a wire move rather than a different part. Note that in low-level operation the yellow input indicator stays illuminated by design.

Transistor Output Version for Inductive Loads and High Cycle Counts

Order the transistor type ([dd] second digit = 2) for an open-drain output rated 12-48V DC / 10A with a 10A freewheeling diode built in, so it drives heavy-duty electromagnets and motors directly with no contact to wear out. Because transistors are more sensitive than relays, plan power sequencing: with the input unconnected, the output may pulse for about 100ms at power-up or power-down.

Applications

Water Level Alarm Systems — A float switch feeds the optocoupler input; when the level crosses the warning line the relay makes and powers the alarm or pump directly. Set the jumper to the right for high-level triggering. The manual's worked example uses the 12V relay-output variant, A1J0101M31.

PLC / Controller Signal Isolation — Placed ahead of a PLC input or behind a PLC output, the module puts DC 1000V (60s type test) of optocoupler isolation between the field wiring and the controller, so a surge or an EFT burst on a long field cable hits a low-cost module instead of an I/O card.

Sensor Dry-Contact Conversion — Converts the DC 0-30V output of proximity switches, photoelectric switches or temperature controllers into an isolated NO/NC dry contact that a downstream counter, recorder or acquisition system can read safely - with the jumper handling sensors of either polarity.

Interposing Relay for Contactor and Solenoid Coils — Drives an AC contactor coil, solenoid valve or motor starter from a low-voltage control signal. The relay contact takes the coil's inrush and back-EMF while the control core stays isolated; for frequent switching or heavy inductive coils, use the transistor version with its 10A freewheeling diode.

Building Automation and Equipment Interlocks — Isolates a low-voltage control signal before it switches fans, lighting or valves in building-automation and equipment-room monitoring, keeping control and power wiring separated. The 'o'-to-'G' permanent-break option gives a hard-wired lockout during maintenance.

OEM Integration Into Instruments and Machines — The 55 x 30mm PCB with 49 x 24.5mm mounting holes, 5.08mm terminal pitch and an optional 35.5 x 60.5 x 22mm case (double-sided tape mountable) drops into OEM control boxes. Without the case, restrict it to safe voltage (0-36V); fit the case before switching AC mains.

Models & Ordering Information

Base Model

A1J0101

Ordering code format A1J01[aa]R[b]T[c]M[dd]; default shipped configuration is M31 (12V DC supply, relay output). Supply voltage (M11-M51) and output type (relay or transistor, second digit of [dd]) are specified at order time.

How to Select

Default configuration is A1J0101M31 (12V DC supply, relay output), which covers most general-purpose applications.
Choose the supply voltage suffix (5/9/12/18/24V) to match your control system's DC rail.
For controlling mains-voltage loads, use the enclosed version; without an enclosure the module is only recommended for safety extra-low voltage (0-36V) control.
Choose the transistor output version for inductive loads, higher switching frequency, or longer contact-free life, and add power sequencing to avoid the brief power-up/power-down pulse.
Choose the relay output version for pure on/off switching where a passive dry contact or mains-voltage load is required; NO and NC contacts are both available.
Set the input trigger polarity with the on-board jumper to match your sensor or control signal's high-level-active or low-level-active logic.

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

When NOT to specify the A1J0101 — and what to use instead

Application needs a delay or timer function

Why not: A1J0101 has no timing element at all — it is an instantaneous optocoupler-input-to-relay amplifier: signal present, relay makes; signal removed, relay breaks. No delay range is published in its parameters because there is none.

Use instead: B2J0101 (power-up delay, 2-30 s) or B2J0201 (trigger delay, 2-30 s). For more modes or longer ranges, B2J0601 or E4J0101.

Switching a load above the output's rated stress

Why not: The relay output's absolute maximum is AC 250 V / 10 A, with normal operation at DC 30 V or AC 0-220 V at 8 A. The transistor version's absolute maximum is DC 55 V / 10 A, normal DC 12-48 V at 8 A. Absolute maximum is a survival limit, not an operating point.

Use instead: Use the A1J0101 contact as a pilot / interposing relay to drive an external contactor sized for the actual load.

Switching AC mains on the bare board with no enclosure

Why not: The manual recommends the caseless board only for safe extra-low voltage control, 0-36 V. Mains-level switching is intended for the version fitted with the optional enclosure.

Use instead: Order the module with the optional 35.5 x 60.5 x 22 mm enclosure fitted before wiring to AC mains.

A machine-safety stop or interlock function

Why not: A1J0101 is a general-purpose optocoupler-isolated input amplifier with an ordinary relay or transistor output. It has no forcibly-guided contacts, no EDM feedback, and no Type / SIL / PL rating.

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

High-cycle switching of an inductive DC load such as a solenoid or small motor

Why not: The relay version's mechanical life is rated above 100,000 operations but only above 10,000 operations under heavy or inductive load. Contact wear becomes the limit long before the mechanical figure on frequent inductive duty.

Use instead: The transistor-output variant, which has no contacts to wear and includes a 10 A freewheeling diode.

Several isolated I/O points on one board or one bus

Why not: A1J0101 is strictly single-channel: one optocoupler input and one relay or transistor output per board.

Use instead: B2J0302 for a single networked point, or the D3J01xx / D3J02xx / D3J03xx multi-channel MODBUS I/O modules for several points on one bus.

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 of the bare board and of the optional enclosure.
MTBF.
Operating and storage relative humidity range.
Terminal wire gauge and screw torque.
Vibration and mechanical shock resistance.
Certification status. The manual records a CCC application as in progress, not granted — we do not claim it. Certification documents are available on request.

Frequently Asked Questions

Is the A1J0101 a safety relay or a standard signal-isolation relay module?

The A1J0101 is a general-purpose optocoupler-isolated input amplifier with relay or transistor output, not a forcibly-guided safety relay with EDM feedback. Use it for signal isolation, level shifting and load switching in standard industrial control; for a safety stop function, use a dedicated safety-rated relay or safety PLC instead.

What supply voltages does the A1J0101 support?

The module is available in 5V, 9V, 12V, 18V or 24V DC supply versions, selected by the model code's [dd] field. The default shipped configuration is the 12V relay output type (M31). Each voltage version has its own normal operating window - for example the 12V DC version accepts 11-14V - so order the variant that matches your control supply.

How do I set the input trigger polarity?

Move the on-board jumper to select high-level operation, where the relay makes on a high input and breaks on a low input, or low-level operation, where the relay makes on a low input and breaks on a high input.

What load can the relay and transistor outputs switch?

The relay output switches DC 30V or AC 0-220V at 8A under normal conditions, with an absolute maximum of AC 250V, 10A. The transistor (open-drain) output version is rated 12-48V DC, 10A and includes a 10A freewheeling diode so it can drive an inductive load directly. Relay mechanical life exceeds 100,000 operations.

Can the optocoupler input and relay output be used independently?

Yes. The optocoupler-isolated input and the relay-isolated output are electrically independent of each other, so the module can be used as a standalone isolated input, a standalone isolated output, or both functions together on one board.

Why does the transistor-output version briefly pulse at power-up?

Transistors are more sensitive than relays, so when the module is powered on or off with the input left unconnected, the open-drain transistor may make momentarily then break (about 100ms). Avoid this with power sequencing: power the module on before its output, and power the output off before the module. The relay-output version does not have this behavior.

Does the A1J0101 meet industrial EMC and safety requirements?

The module has been tested for ESD (6kV), electrical fast transient (2-4kV) and voltage surge (1kV) immunity per IEC 61000-6-2 basic industrial requirements, and its creepage distance and electrical clearance exceed pollution-degree-3 safety requirements. Certification documents are available on request.