ETI PI-800 Gen2 Modular Circuit Breaker Primary Injection Test Set

Overview

The ETI PI-800 Gen2 Modular Circuit Breaker Primary Injection Test Set is a high-fidelity, portable primary current injection system engineered for precision verification of low-voltage circuit breakers, molded-case circuit breakers (MCCBs), insulated-case circuit breakers (ICCBs), and air circuit breakers (ACBs) up to 800 A frame rating. Unlike conventional secondary injection testers, the PI-800 Gen2 delivers true primary current directly into the breaker’s main current path—enabling full evaluation of thermal-magnetic trip units, solid-state electronic trip systems, and mechanical actuation integrity under real-world fault-level stress. Its core architecture employs digitally controlled silicon-controlled rectifiers (SCRs) synchronized to AC voltage zero-crossing points, eliminating DC offset in output waveforms and ensuring repeatable, metrologically traceable test conditions—even during sub-cycle pulse durations as short as 0.01 seconds. This zero-offset capability is critical for validating instantaneous and short-time delay trip functions per IEEE C37.58 and IEC 60947-2 requirements.

Key Features

• Modular, field-configurable output architecture supporting three standard output voltages: 4.2 VAC (800 A continuous), 8.4 VAC (400 A continuous), and 2.1 VAC (1600 A pulsed)—enabling optimized impedance matching across diverse breaker types and cable-connected applications.
• Dual-input voltage compatibility: Option A accepts 120–240 VAC; Option B supports 208–277 VAC—ensuring operational flexibility across North American commercial and industrial power distribution environments.
• Integrated MAC-21 control instrument with intuitive front-panel interface, real-time current monitoring, programmable timer (0–9999 s/cycles), and pulse-mode initiation for precise transient testing without preheating.
• Ruggedized transport enclosure: Aluminum-reinforced polymer chassis with interlocked lid, recessed side handles, and integrated casters—total weight 44 lb (20 kg) for single-operator mobility and site deployment.
• Forced-air cooling system with rear-mounted exhaust directs airflow over both internal transformer windings and external output cables—extending duty cycle capability and enabling rapid recovery between successive overload tests.
• Eight silver-plated busbar output terminals with press-fit 3/8″-16 stainless steel threaded inserts—eliminating nut-torque variability and enabling rapid reconfiguration for varying breaker terminal geometries and test setups.

Sample Compatibility & Compliance

The PI-800 Gen2 is validated for testing a broad spectrum of low-voltage protective devices, including thermal-magnetic MCCBs, microprocessor-based trip units (e.g., Eaton EDB, Siemens 3WL, ABB Tmax), draw-out ACBs, and bus-connected current transformers (CTs) during ratio and saturation checks. Its output waveform fidelity—maintained within <±0.5% total harmonic distortion (THD) at rated load—meets the current source stability requirements defined in IEEE Std C37.58-2020 for primary injection testing. The system supports full documentation traceability through its RS-232 ASCII output interface, enabling direct integration with laboratory information management systems (LIMS) and compliance with FDA 21 CFR Part 11 and ISO/IEC 17025 data integrity mandates when paired with validated software platforms. All safety interlocks, grounding provisions, and insulation ratings conform to UL 61010-1 and CSA C22.2 No. 61010-1 for Class I, Pollution Degree 2 environments.

Software & Data Management

The PI-800 Gen2 communicates via a standard RS-232 serial interface (9600 baud, 8 data bits, no parity, 1 stop bit) to export time-stamped current readings, timer values, and pass/fail status in plain-text ASCII format. This protocol enables seamless ingestion into spreadsheet applications, custom SCADA logging tools, or enterprise calibration management systems. When used with ETI’s optional TestLog Pro software (sold separately), users gain automated report generation compliant with ASTM E2911-22 and NIST-traceable uncertainty budgets. Audit trails include operator ID, test date/time, input voltage, selected output mode, measured current, elapsed duration, and system firmware version—supporting GLP and GMP-regulated maintenance records for utility substations, data center infrastructure, and pharmaceutical manufacturing facilities.

Applications

• Primary injection testing of LV circuit breakers per IEEE C37.58 and IEC 60947-2 type-test and routine maintenance protocols.
• Thermal run testing of bus ducts, cable assemblies, and switchgear connections at sustained 400–800 A loads.
• CT ratio verification and knee-point voltage assessment using the 2.1 VAC / 1600 A configuration.
• Validation of solid-state trip unit response to asymmetric fault currents—including instantaneous, short-time, and ground-fault elements.
• Commissioning and periodic verification of arc-flash mitigation systems requiring precise current-source triggering.
• Factory acceptance testing (FAT) and site acceptance testing (SAT) for OEM switchgear integrators and EPC contractors.

FAQ

What is the maximum continuous output current, and under what conditions?
The PI-800 Gen2 delivers 800 A continuously at 4.2 VAC when supplied from a 240 VAC source (Option A) or 277 VAC (Option B), with thermal management maintained by active forced-air cooling.

Can the unit test breakers rated above 800 A frame size?
Yes—using the 2.1 VAC / 1600 A configuration, it supports limited-duration thermal and mechanical testing of larger air circuit breakers and bus connections, provided load impedance remains within specified limits.

Does the system support automated test sequencing?
While the base unit operates manually, its RS-232 interface enables full remote control and script-driven test execution when integrated with third-party automation frameworks or ETI’s TestLog Pro software.

Is calibration certification included with shipment?
Each unit ships with a NIST-traceable factory calibration certificate valid for 12 months; on-site recalibration services are available through ETI-authorized service centers globally.

How is safety ensured during high-current operation?
The system incorporates dual redundant thermal cutoffs, output current limiting circuitry, grounded chassis design, and mechanical interlocks that disable output unless all access panels are fully secured and grounding studs are connected.