ACB RETROFIT
At Mashel Electric, we specialize in professional ACB Retrofit services, offering a strategic upgrade path for your aging Low Tension (LT) switchgear. As Air Circuit Breakers (ACBs) age, they often suffer from mechanism fatigue, contact wear, and obsolete protection features. Our retrofitting solutions replace outdated breaker units with modern, technologically advanced ACBs, revitalizing your power distribution system without the high costs and long lead times associated with full panel replacement.
Our certified engineers provide end-to-end solutions, from initial site surveys to final commissioning. We engineer custom adaptation kits that allow new-generation ACBs to fit seamlessly into existing panel enclosures and cradles. This approach extends the lifespan of your infrastructure, enhances safety with modern trip units, and ensures compliance with current IEC standards. Trust us to modernize your electrical assets with precision, minimizing downtime and maximizing your return on investment.
FUNCTIONALITY
Our ACB retrofit process involves the precise replacement of legacy air circuit breakers with state-of-the-art units. We begin by verifying the dimensions and busbar connections of the existing switchboard. Using custom-designed adaptor plates and linkages, we install the new ACB, ensuring perfect alignment with the existing draw-out cradle or fixed mounting. The upgraded ACB features advanced microprocessor-based trip units that provide accurate protection against overloads, short circuits, and earth faults. This functional upgrade restores the switchgear's breaking capacity and reliability while retaining the original panel structure and busbar system.
Technical Specifications
| Parameter | Specification |
|---|---|
| Rated Voltage | 415V / 690V AC (Low Voltage) |
| Rated Current (In) | 630A / 800A / 1000A / 1250A / 1600A / 2000A / 2500A / 3200A / 4000A / 6300A |
| Breaking Capacity (Icu) | 50kA / 65kA / 80kA / 100kA / 150kA |
| Applicable Standards | IEC 60947-2, IS 13947-2 |
| Protection Release | Electronic Trip Unit (LI, LSI, LSIG) with LCD display and communication |
| Operating Mechanism | Motorized Spring Charged / Manual Spring Charged |
| ACB Brands Supported | Schneider (MasterPact/Compact), Siemens (3WL), ABB (Emax), L&T, Eaton, Legrand |
| Mounting Type | Fixed / Draw-out (Retractable) |
| Interlocking | Mechanical and Electrical Interlocks for safety |
| Communication | Modbus, Profibus, Ethernet (Optional) |
Benefits
- Cost Optimization: Retrofitting saves substantial capital compared to full switchboard replacement by reusing existing enclosures, busbars, and cabling.
- Minimal Downtime: Pre-engineered retrofit kits allow for rapid installation, often completing the upgrade within a scheduled maintenance window.
- Enhanced Protection: Integration of modern electronic trip units (ETUs) provides precise settings, zone selectivity, and event logging features.
- Spare Parts Availability: Upgrading to current-generation ACBs ensures easy availability of spares and service support, eliminating obsolescence issues.
- Improved Safety Standards: New breakers offer advanced arc quenching technologies and reliable isolation, ensuring operator safety.
- Non-Invasive Installation: Eliminates the need for civil modifications or rewiring, preserving the integrity of the existing electrical room.
- Asset Longevity: Extends the operational life of the main power distribution panel by another 15-20 years.
Applications
- Main Incoming Panels (PCC): Upgrading the main incomers in Power Control Centers to handle higher loads and fault levels.
- Industrial Manufacturing Plants: Retrofitting switchgear in automotive, steel, and process industries where production continuity is critical.
- Commercial High-Rises: Modernizing LT panels in malls, IT parks, and hotels to meet current safety regulations.
- Data Centers: Ensuring highest reliability of power distribution units (PDUs) with zero downtime upgrades.
- Utilities & Substations: Replacing obsolete breakers in distribution transformers and ring main units.
- Healthcare Facilities: Upgrading critical power infrastructure in hospitals without disrupting sensitive medical equipment.
- Infrastructure Projects: Airports and metro stations requiring upgrade of legacy panels for modern load demands.
- Generator Control Panels: Retrofitting ACBs used for generator synchronization and export control.
Retrofit Engineering
- Precise Site Audits: Detailed dimensional verification of the existing cradle and compartment to ensure the new ACB fits perfectly.
- Custom Adaptor Fabrication: Manufacturing of precision adaptor plates and spigots to mate the new breaker with the old busbar droppers.
- Cradle Refurbishment: Inspection and repair of the draw-out cradle mechanism, shutters, and interlocks to ensure smooth operation.
- Secondary Wiring Integration: Seamless integration of new control wiring with the existing protection and metering circuits.
- Testing & Certification: Rigorous type testing of the retrofit assembly to validate short circuit withstand and temperature rise.
Quality Assurance
- Primary Injection Testing: Verifying the correct operation of the trip unit and protection settings using primary current injection.
- Insulation Resistance Test: Ensuring the integrity of the insulation between phases and earth after installation.
- Contact Resistance Measurement: Measuring milli-volt drop across contacts to ensure low resistance connections.
- Mechanical Operation Checks: Verifying the smooth racking-in/out operation and spring charging mechanism.
- Interlock Safety Test: Testing the safety interlocks (door interlock, trip-free mechanism) to prevent unsafe operation.
Key Features
Advanced Trip Units
Equipped with intelligent electronic releases offering adjustable protection curves (L, S, I, G) and metering capabilities.
Draw-out Mechanism
Retrofitted units maintain the draw-out functionality for easy isolation, inspection, and maintenance without busbar shutdown.
High Breaking Capacity
New generation ACBs offer superior short-circuit breaking capacities up to 150kA, enhancing system stability.
Smart Communication
Optional communication modules for integration with SCADA and BMS systems for real-time monitoring.
Arc Flash Safety
Modern arc chute designs effectively extinguish arcs, reducing arc flash hazards and protecting personnel.
Motorized Operation
Options for motorized spring charging and electrical closing for remote operation and automation.
Plug-and-Play Adaptors
Custom fabricated adaptor kits ensure the new breaker connects seamlessly to existing busbars and cables.
Event Logging
Onboard memory stores trip events and fault data, aiding in quick troubleshooting and root cause analysis.
Low Maintenance
Modern ACB designs require significantly less maintenance compared to legacy models, reducing operational costs.
Compact Design
New generation breakers often have smaller footprints, making the retrofit fit easier in cramped panels.
Safety Shutters
Verification and refurbishment of safety shutters to cover live contacts when the breaker is withdrawn.
Comprehensive Warranty
Full warranty coverage on the new ACB unit and the retrofit installation work.
Why Choose Mashel Electric
Mashel Electric is a trusted partner for switchgear modernization, combining technical expertise with premium components to deliver reliable retrofit solutions.
Customized Engineering
We design bespoke retrofit solutions tailored to your specific panel dimensions and brand requirements.
Premium Brands
We source ACBs from global leaders like Schneider, Siemens, and ABB to ensure top-tier quality and performance.
Turnkey Execution
From site audit to commissioning, we manage the entire project lifecycle, ensuring a hassle-free experience.
Fast Turnaround
Our efficient processes and ready stock of components minimize lead times and operational downtime.
Certified Processes
All retrofitting works are conducted in strict adherence to safety protocols and IEC standards.
After-Sales Support
Backed by a dedicated service team for maintenance, troubleshooting, and spare parts supply.
Frequently Asked Questions
ACB Retrofit involves replacing an old or faulty Air Circuit Breaker with a new unit while keeping the existing switchboard panel and busbars intact. It often requires custom adaptor plates to fit the new breaker into the old cradle or enclosure.
In many cases, yes. Retrofitting is significantly more cost-effective and faster than full panel replacement. It avoids civil work, rewiring, and long production outages. It is the ideal solution when the panel enclosure and busbars are in good condition, but the breaker mechanism is obsolete.
Yes, we specialize in cross-brand retrofitting. We can replace an old legacy breaker (e.g., old GEC or Siemens models) with a modern ACB from a brand of your choice (e.g., Schneider or ABB) by engineering the necessary mounting and connection adaptors.
No. One of the main advantages of retrofitting is that the main busbars are usually retained. We design flexible connections (flexibles/spigots) to connect the new breaker to the existing busbar system without altering the main structure.
We provide a comprehensive warranty on the new ACB unit (as per manufacturer terms) and our installation work. This ensures your upgraded asset is protected against manufacturing defects and installation anomalies.