Agilent/Keysight 59511A Polarity Reversal Relay Device

The Agilent/Keysight 59511A is a remote-controlled polarity reversal relay device that switches DC power outputs for test and measurement applications. An internal microprocessor sequences switching of power and sense leads to minimize voltage overshoots and protect connected loads. The unit operates via GPIB control with compatible Agilent system power supplies or TTL control for other applications, making it suitable for DC output polarity reversal, multi-fixture switching configurations, and fault-condition emergency shutdown.

Technical Specifications

• Power Handling: 200 V at 20 A, 120 V at 30 A, or 48 V at 60 A DC


• Floating Voltage: Input to output 200 VDC; input or output to ground 500 VDC; TTL control to ground 240 VDC


• Relay DC Voltage Drop: 0.5 V maximum at 60 A (measured between IN and OUT terminals)


• Settling Time (TTL control): Connect 440 ms, disconnect 160 ms, polarity reversal 600 ms


• AC Input: Configurable for 100, 120, 200, or 240 VAC (–13%, +6%) at 48 to 63 Hz


• Maximum Input Power: 60 VA


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


• Weight: 3.6 kg net (8 lb); 5.0 kg shipping (11 lb); 5.5 kg with Rack Mount Kit Option 850 (12 lb)

Key Features

• Switches one power supply output per unit with sequenced power and sense lead control


• Microprocessor-based switching architecture minimizes overshoot transients


• Dual control interfaces: GPIB (Agilent-integrated) and TTL (universal)


• Three-axis mounting capability via PEM fasteners; mounting orientation ±10° from vertical


• Optional Rack Mount Kit (Option 850) for standard 19-inch installations

Typical Applications

• DC load polarity testing and reversal


• Multi-fixture automated test switching


• Fault condition protection with rapid emergency shutdown


• Integrated system power supply control in production test environments

Compatibility & Integration Designed for use with Agilent system power supplies including 603xA series models. Compatible with any DC power supply within specified voltage and current limits.