Astronics / EADS / Racal 1250-15A Relay Driver Module

The Astronics/EADS/Racal 1250-15A is a 24-channel relay driver module engineered for external relay control within the Racal 1250 Universal Switch Controller system. It delivers current-sinking outputs paired with confidence-testing sense inputs, supporting both internal +13V DC and external supplies up to +30V for relay coil actuation. The module integrates directly into automated test equipment and applications across aerospace, military, and industrial domains.

Technical Specifications

Output Drivers: 24 current-sink channels

Sense Inputs: 24 feedback channels for confidence testing

Internal Supply: +13V DC at 1.7 A (fused)

External Supply: Up to +30V DC

Output Voltage (Off State): 30 V maximum

Output Voltage (On State): 1.6 V maximum

Per-Channel Current: 350 mA @ 100% duty cycle

Group Current Limits: 1.0 A per group (CH00–CH07, CH08–CH15, CH16–CH23)

Total Module Current: 3.0 A (external supply)

Sense Input Impedance: 6.8 kΩ

Sense Input Voltages: 9.30 V (de-energized), 0–1.6 V (energized)

Key Features

Three DB25 connectors carrying output drivers, sense inputs, supply voltage, and return lines

Break-Before-Make (BBM), Make-Before-Break (MBB), and Immediate (IMM) switching modes

Command syntax supporting OPEN, CLOSE, SETUP, PSETUP, RESET, and PDATAOUT operations

Modular plug-in card design compatible with 1250 chassis (slots 1–5 or 1–14)

Scalable architecture for complex multi-channel switching requirements

Typical Applications

Automated test equipment (ATE) environments

Aerospace and defense test systems

Industrial relay control and signal switching

Systems requiring external relay actuation with real-time feedback validation

Compatibility & Integration The 1250-15A operates exclusively within the Racal 1250 Universal Switch Controller framework. Slot-based configuration and command-driven control enable integration into hierarchical test architectures without external interface modules.