Industrial applications often require isolated dry contact outputs. The Schneider ASB840000 delivers reliable relay switching for mixed voltage loads. This module functions as a relay output card for Modicon PLC platforms. Schneider Electric designed this unit for maximum field wiring flexibility.
Technical Specifications & Dimensions
This module provides galvanically isolated relay outputs for various load types. The table below outlines its core technical parameters.
| Parameter | Specification |
|---|---|
| Number of Outputs | Configurable (typically 8 to 16 points) |
| Output Type | Form A (SPST) relay contacts |
| Contact Rating | 2A at 24V DC or 120V AC |
| Maximum Switching Voltage | 250V AC or 125V DC |
| Maximum Load Current | 2A per common |
| Contact Resistance | 100 mΩ maximum |
| Response Time (Operate) | 10 ms typical |
| Response Time (Release) | 5 ms typical |
| Mechanical Life | 20 million operations |
| Electrical Life | 100,000 operations at rated load |
| Power Supply | 5V DC from backplane |
| Current Consumption | 200 mA typical |
| Unit Weight | 0.45 kg (0.99 lbs) |
Construction and Interface Layout
This module features a rugged plastic housing with sealed relay covers. Such a design protects contacts from dust and moisture ingress. Furthermore, the Schneider ASB840000 provides a front-accessible terminal block for field wiring. You will find screw terminals for each relay output on this interface. Each terminal accepts wire sizes from 0.2 to 2.5 mm². An LED indicator shows the energized status for every relay channel.
Energy Storage and Contact Protection
Unlike solid-state modules, this relay card uses mechanical contacts for switching. The module includes no significant energy storage components. Consequently, the Schneider ASB840000 provides true dry contact isolation for field circuits. Each relay coil requires only 50 mA from the 5V backplane supply. This low power consumption keeps the module cool during operation. The board does not require any batteries for configuration storage.
Installation and Mounting Requirements
Installing the Schneider ASB840000 takes only a few minutes of work. The unit snaps directly onto a standard DIN rail. It also locks securely with a bottom-mounted retaining clip. Always disconnect all field power before wiring or removing this module. The unit uses passive cooling through natural air circulation. This design eliminates fan noise and moving parts. Allow adequate space for field wiring access to the terminals.
Integration with Modicon PLC Systems
This relay module works perfectly with Schneider Modicon PLCs. It switches AC or DC loads regardless of voltage polarity. Operators can use these outputs for motor starters, valves, and alarms. The Schneider ASB840000 provides electrical isolation between the PLC and field devices. Consequently, this model remains an excellent choice for mixed voltage applications. The unit delivers consistent performance across a 0°C to 55°C temperature range.
Details
| Weight | 0.91 kg |
|---|---|
| Dimensions | 110 × 55 × 90 mm |
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