Overview
The Crompton Instruments 077-08AA-LSUA is a high-range AC ammeter designed for switchboard and panel-mount applications in industrial and utility systems. This 0–3000A AC gauge measures line current with precision and is constructed to withstand the mechanical and thermal demands of heavy industrial environments. The model is part of Crompton’s proven analogue instrument family, trusted for decades in power distribution, motor control, and generation monitoring.
Key Features
- Range: 0–3000A AC, ideal for large industrial loads and transmission systems
- Panel-mounted design fits standard switchboard and control enclosures
- Analogue needle indication for intuitive, glance-readable current measurement
- Heavy-gauge steel construction with toughened glass window for durability
- Transformer-rated operation at 40–70 Hz with 0.3VA burden
- Gas-tight zero adjuster for long-term calibration stability
Technical Specifications
- Measurement Type: AC Current (Amperes)
- Range: 0–3000A AC
- Frequency Rating: 40–70 Hz
- Burden: 0.3VA
- Case Construction: Pressed steel with die-cast bezel
- Window: Toughened glass with anti-reflective properties
- Zero Adjustment: Gas-tight mechanism
- Movement Type: Analogue pointer
- Mounting: Switchboard panel or flush-mount enclosure
- Standard Compliance: ANSI, IEC
Typical Applications
- High-amperage industrial motor circuits
- Power generation and utility switchboards
- Large transformer primary or secondary monitoring
- Welding and heavy manufacturing equipment
- Electrical distribution and load management systems
- Process automation and process control panels
Compatibility & Replacements
Compatible With
- Standard ANSI switchboard enclosures and control panels
- Industrial meter mounting brackets and sockets
- AC transformer-fed measurement circuits (current transformer inputs)
- Power distribution systems operating at 40–70 Hz frequency
Replaces / Drop-In Replacement For
Verify compatibility with your original equipment documentation or contact our team for specific cross-reference models. The 077-08AA-LSUA is a common replacement for legacy Crompton high-range ammeters of similar ANSI panel dimensions.
Works With
- Current transformers (CTs) rated for secondary of 5A at 3000A primary full-scale
- ANSI standard switchboard meter mounting provisions
- AC systems: 40–70 Hz, industrial 3-phase or single-phase supplies
- Legacy and modern electrical control architectures requiring panel-mount indication
