Agilent/Keysight 59510A Relay Accessory

The Agilent/Keysight 59510A Relay Accessory is a remote-controlled switching device for DC power isolation and sequencing in electronic testing and troubleshooting. It enables load isolation from DC outputs, power and sense lead sequencing, and emergency shutdown capability against fault conditions. The unit integrates with Agilent 66xxA and 603xA series power supplies via GPIB, or operates independently using TTL control interfaces.

Technical Specifications

• 200 V at 20 A


• 120 V at 30 A


• 48 V at 60 A


• DC voltage drop: 0.5 V maximum per relay at 60 A Floating Voltage Isolation


• Input to output: 200 Vdc


• Input or output to ground: 500 Vdc


• TTL control to ground: 240 Vdc TTL Control Response


• Connect settle time: 440 ms


• Disconnect settle time: 160 ms


• Polarity reversal: 600 ms AC Input


• Configurable: 100, 120, 200, or 240 Vac


• Voltage tolerance: −13% to +6%


• Frequency: 48 to 63 Hz Control Interfaces


• TTL control port


• GPIB control (with compatible Agilent power supplies)


• Remote inhibit (INH) input


• Fault (FLT) output Physical


• Dimensions: 185.4 mm W × 130.6 mm H × 198.6 mm D


• Net weight: 2.3 kg; Shipping weight: 3.6 kg


• Mounting orientation: ±10° from vertical

Key Features

• Dual-relay architecture for independent switching control


• Low on-state voltage drop minimizes power loss


• Wide isolation voltage capability for floating applications


• Configurable AC power input accommodates international supply standards


• Emergency shutdown via remote inhibit line


• Fault reporting output for system diagnostics

Typical Applications

• Load isolation during power supply testing


• Sequential power-up control in multi-rail systems


• Sense lead switching for precision measurement


• Automated test sequences with fault recovery


• DC power distribution switching up to 60 A

Compatibility & Integration Direct compatibility exists with Agilent 66xxA and 603xA series power supplies. The unit operates with any DC supply meeting the specified voltage and current limits. Not recommended for use with 6680A, 6681A, 6682A, 6683A, 6684A, or 6035A models. Optional accessories include rack mount kit (Option 850) and additional operating manual (Option 910). Product is discontinued with no direct replacement available.