PR 4179B Universal Trip Amplifier

The PR 4179B Universal Trip Amplifier is a high-precision industrial signal conditioning and monitoring device for reliability and performance in demanding automation environments. The 4179B, from PR electronics, is ideal for measuring AC current as well as AC voltage signals with exceptional accuracy (< 0.3% of span). This universal trip amplifier supports versatile applications across process control, safety systems, in addition to machine monitoring. Its wide input ranges for current (0-5 AAC) and voltage (0-300 VAC) allow seamless integration with standard sensor inputs and configurable fields to meet specific system requirements.

• The 0-5 AAC RMS range makes it possible to accurately measure a typical current transformer.
• The 0-300 VAC RMS range allows accurate supply voltage monitoring.
• The device measures standard input ranges and can freely configure to customer-defined input range.
• Process control with 2 pairs of potential-free relay contacts which can configure to suit any application.
• Trip amplifier with window function allowing the relay to change state within a high and a low setpoint on the input span.
• Simulation of process value during commissioning as well as maintenance.
• All terminals feature protection from over-voltage, polarity, and short-circuit.
• The PR 4179B provides the necessary failure data (SFF and PFDAVG) for SIL 2 applications as per IEC 61508 / IEC 61511.
• Failure rates for 4179B correspond to Performance Level "d" according to ISO-13849.

PR 4179B Universal Trip Amplifier from PR electronics

Featuring dual relay outputs and configurable setpoints with a window function, the PR 4179B Universal Trip Amplifier enables precise trip detection, alarm signaling, and process control while ensuring operational flexibility. The device’s universal power supply (21.6–253 VAC / 19.2–300 VDC), robust design with galvanic isolation (2.3 kVAC), and extended EMC immunity make it ideal for industrial automation, utilities, oil and gas, and manufacturing sectors.

• Accuracy < 0.3% of span.
• Temperature coefficient 0.01%/˚C. 
• Response time < 0.75 s for measuring AC current / voltage signals.
• High galvanic isolation of 2.3 kVAC.
• Extended EMC immunity: NAMUR NE21, A criterion, burst.
• Functional safety: HW assessment, SFF > 90%.

Easy Mounting, Installation, and Programming

With support for process monitoring, diagnostics, and programming via PR 4500 Series interfaces, the PR 4179B Universal Trip Amplifier delivers reliable performance in safety-critical systems. It meets SIL 2 requirements and achieves PL "d" compliance per ISO-13849 standards. Trusted by engineers for accuracy, durability, and configurability, the 4179B is the ultimate trip amplifier solution for modern control systems.

• Configuration, monitoring, and diagnostics using PR 4500 detachable communication interfaces.
• Product-specific functionality includes communication via Modbus and Bluetooth using our PR Process Supervisor (PPS) application, available for iOS and Android.
• All programming supports password protected.
• Scrolling help text in 7 languages.
• Units can mount side by side, horizontally, and vertically, without air gap on a standard DIN rail, even at 140˚F (60˚C) ambient temperature.