Description

PR 4179B Universal Trip Amplifier – PR Electronics

The PR Electronics 4179B Universal Trip Amplifier is a versatile AC/DC trip amplifier with two relay outputs, designed for accurate monitoring of current and voltage signals in industrial applications. With universal input ranges, advanced relay functions, and functional safety compliance, the PR 4179B ensures reliable performance in demanding process control environments.

Key Features

• Measures AC current up to 5 AAC RMS and AC voltage up to 300 VAC RMS

• Two relay outputs for trip, alarm, or process control applications

• Response time < 0.75 s with accuracy better than 0.3% of span

• Universal power supply: 21.6…253 VAC / 19.2…300 VDC

• Programmable via PR 4500 detachable display series

• Supports Modbus and Bluetooth communication via PR Process Supervisor (PPS) app

• High 2.3 kVAC galvanic isolation for safe operation

• Fully compliant with SIL 2 (IEC 61508/61511) and ISO-13849 Performance Level d

Applications

• Supply voltage monitoring up to 300 VAC RMS

• Current transformer measurement up to 5 AAC RMS

• Configurable trip amplifier with setpoint, window, latch, or error indication

• Relay-based process protection for motors, pumps, and control systems

• Simulation of process values for commissioning and maintenance

• Ideal for industries requiring functional safety and high EMC immunity

Technical Highlights

• Accuracy: < 0.3% of span | Temp. coefficient: 0.01%/°C

• Bandwidth: 40…400 Hz | Input resolution: 20 bit

• Relay delay: 0–3600 s | Power-on delay: up to 9999 s

• Input resistance: < 0.042 Ω (current) / 3 MΩ || 100 pF (voltage)

• LED status indicators and multilingual help text

• DIN rail mountable (109 x 23.5 x 104 mm)

Certifications & Approvals

• c UL us, UL 508 (E248256)

• RoHS, EMC, LVD compliant

• SIL hardware assessed for functional safety

Product Details

Part Number: PR 4179B
Product Name: Universal AC/DC Trip Amplifier
Manufacturer: PR Electronics
Origin: Denmark
Condition: New / Original Packing

PR 4179B Universal trip amplifier is AC/DC Trip Amplifier with 2 relay outputs.

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Functional highlights

• 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 be freely configured to customer-defined input range.
• Process control with 2 pairs of potential-free relay contacts which can be configured 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 / maintenance.
• All terminals are over-voltage protected, polarity protected and short-circuit protected.
• The 4179B provides the required failure data (SFF and PFD_AVG) for SIL 2 applications as per IEC 61508 / IEC 61511.
• Failure rates for 4179B correspond to Performance Level “d” according to ISO-13849.

Technical characteristics – PR 4179B Universal trip amplifier

• 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%.

Programming – PR 4179B Universal trip amplifier

• 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 can be password protected.
• Scrolling help text in 7 languages.

Mounting / installation

• Units can be mounted side by side, horizontally and vertically, without air gap on a standard DIN rail, even at 60°C ambient temperature.

Data sheet

• 4179B.pdf