Products Description
ABB INIIT03 Residual Current Operated Relay
The ABB INIIT03 is a Residual Current Operated Relay (RCO Relay) designed for industrial and commercial electrical systems. It monitors residual currents in electrical circuits and triggers protective actions when leakage currents exceed predefined thresholds. This relay ensures enhanced safety for equipment and personnel by preventing potential electrical faults, short circuits, and leakage-related hazards.
The INIIT03 is compact and modular, allowing easy integration into ABB protective relay panels or switchgear assemblies. Its design emphasizes rapid response and reliable operation under continuous industrial load conditions.
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Our address
32D Guomao Building, Siming District, Xiamen, Fujian, China
Phone Number(Whatsapp)
+86-18020714492
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Functional Role / System Position
The INIIT03 RCO Relay is installed within the protective layer of an electrical distribution system:
Electrical Circuit → INIIT03 Residual Current Operated Relay → Protective Trip / Alarm Outputs → Circuit Breakers or Automation Logic
In this role, the relay continuously monitors the differential current between phase and neutral conductors. Upon detecting a residual current beyond its set threshold, it activates trip signals or alarms to isolate the affected circuit.
Key Features / Functional Capabilities
■ Monitors residual currents to detect leakage or ground faults
■ High-speed operation for rapid fault isolation
■ Adjustable current sensitivity settings for flexible protection
■ Compact design for integration into ABB relay panels or switchgear
■ Provides both trip and alarm output contacts
■ Designed for continuous industrial operation under varying load conditions
Application Areas / Typical Use Cases
- Protection of industrial and commercial electrical circuits against earth leakage
- Integration into ABB motor control centers and distribution panels
- Ground fault detection in machinery, HVAC, and pump systems
- Safety systems for industrial automation where residual current monitoring is critical
Product Identification
| Parameter | Description |
|---|---|
| Product Type | Residual Current Operated Relay |
| ABB Model Number | INIIT03 |
| Operating Current Range | 30 mA – 500 mA (configurable) |
| Rated Voltage | AC 230–400 V |
| Response Time | ≤ 30 ms |
| Output Contacts | 1 NO / 1 NC (trip and alarm) |
| Mounting Type | DIN rail or panel mount |
| Duty Cycle | Continuous |
Installation / Handling
The INIIT03 should be mounted on a DIN rail or within a control panel according to ABB installation guidelines. Ensure correct wiring for line, neutral, and load connections. All installation and maintenance operations must be performed with the power supply disconnected.
Advantages / Value Highlights
By continuously monitoring leakage currents, the INIIT03 ensures rapid detection and isolation of residual current faults, minimizing equipment damage and improving safety. Its modular design allows easy integration and replacement in existing ABB protective systems, ensuring consistent operational reliability.
Supply & Warranty Information
One-year warranty. Supplied through authorized ABB and industrial automation spare parts distributors.
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Common problems
Q1: What is the primary function of the ABB INIIT03 relay?
It monitors residual currents and triggers protective action when leakage exceeds preset thresholds.
Q2: Can this relay be used in both industrial and commercial applications?
Yes, it is suitable for a wide range of circuits requiring residual current protection.
Q3: What outputs are available on the INIIT03?
It provides trip and alarm output contacts for circuit breakers or automation systems.
Q4: Is the sensitivity adjustable?
Yes, current sensitivity can be configured according to the protection requirements of the installation.
Q5: How should the relay be installed?
It should be mounted on a DIN rail or in a control panel, following ABB wiring and safety guidelines, with the power disconnected during installation.
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