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 mission-critical 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.