Diesel Generator Transfer Switch
A diesel generator transfer switch is the piece of switchgear that decides, in the moment utility power drops, whether the load should be running on mains or on the generator. MST/Milestone builds these panels to pair with any of our diesel genset ranges, so the changeover from grid to generator - and back again - happens automatically, without someone needing to run out and flip a breaker.
Think of it as the traffic controller between two power sources. Once the incoming mains supply drops out or drifts outside safe limits, the switch signals the standby diesel engine to crank, waits for the generator to reach stable voltage and frequency, then transfers the connected load over - all within seconds and without any manual step. MST supplies this type of diesel generator transfer switch in PC-level, MCCB-level and contactor-level builds, around leading controller brands such as ComAp, DSE, SmartGen and Lixise, and housed in enclosures rated for indoor switch rooms or outdoor, dusty and humid job sites. Whether the project calls for a single-set changeover panel or a synchronized multi-generator paralleling system feeding a hospital, factory or data center, our engineering team sizes the switch rating, current class and enclosure to match the connected load.
Core Product Advantages
Rapid Auto Power Transfer
Detects mains loss and completes switchover in as little as 7 seconds, with a 3–10 second delay window that can be adjusted to suit sensitive loads or sequenced starting.
Auto/Manual Dual Control with Live Visualization
Operators can run the panel in fully automatic mode or take manual control at any time, while a front-panel display shows mains status, generator status and load in real time, cutting routine inspection work.
Parallel-Ready & Grid-Tie Capable
Designed to scale from a single genset to two or more units running in parallel, or to tie into the utility grid, so additional load can be added later without replacing the core switch.
4-Level Mechanical & Electrical Interlock
Redundant interlocking between the mains and generator contacts physically prevents both sources from ever being connected at the same time, protecting personnel and equipment.
Roomy, Pre-Wired Cable Compartment
A generous internal layout leaves space for field cable entry and termination, so electricians can land conductors quickly without cramped, error-prone wiring.
Full Fault Protection Package
Over/under-voltage, over/under-frequency, reverse-power and overload protections are pre-programmed to the connected equipment's safety limits, reducing unplanned downtime.
Available Configurations
Switch types: PC-level, MCCB-level and contactor-level ATS panels
Controller options: ComAp, DSE, SmartGen, Lixise or customer-specified brand
Pole arrangement: 3-pole (3P) and 4-pole (4P) switching available
Enclosure protection: IP30 to IP54, for indoor switch rooms or outdoor cabinets
Current rating: scalable from small single-genset backup panels up to large multi-set paralleling switchgear
Compatible with single-generator standby systems and multi-generator load-sharing/synchronization plants
Products Description
- Hospitals and healthcare facilities - uninterrupted power for life-critical equipment during grid failure
- Data centers and IT infrastructure - clean, fast changeover to protect servers and network uptime
- Manufacturing plants and production lines - prevents costly line stoppages during utility outages
- Commercial buildings and shopping centers - keeps lighting, lifts and safety systems running
- Telecom base stations and remote sites - dependable changeover where staff are not on hand to switch manually
- Multi-generator power plants and microgrids - synchronizes several gensets and shares load automatically
Core Capabilities, Customized to You
No two power systems are identical, so every MST ATS panel is engineered around the customer's actual load profile and site conditions rather than sold off a fixed spec sheet.
- Precision Switching Logic - Transfer delay, re-transfer delay and start/stop sequencing are programmed to match generator warm-up time and load sensitivity.
- Ruggedized & Adaptable Design - Custom IP-rated enclosures, cable entry positions and finishes are available for coastal, high-dust, high-humidity or extreme-temperature sites.
- Comprehensive Protection - Voltage, frequency, phase-sequence and overload thresholds are set to the safety limits of the connected generator and load, minimizing nuisance trips and downtime.
FAQ
Q: What does a diesel generator transfer switch actually do?
A: The ATS continuously monitors the utility mains and, if it fails, automatically starts the generator and shifts the load over - without anyone needing to run out and flip a breaker. It also switches the load back to mains once utility power is stable again.
Q: How quickly does the ATS transfer the load to the generator?
A: Once the generator reaches stable voltage and frequency, transfer is typically completed within 7 seconds, though the delay can be set from 3 to 10 seconds to suit the connected equipment.
Q: Can a single ATS panel manage two or more diesel generators running together?
A: Yes. MST offers paralleling and synchronization control cabinets that let multiple generators share load and feed a common bus through the same switching system, and the panel can be sized upfront to allow future generators to be added.
Q: What is the difference between an automatic transfer switch (ATS) and a manual transfer switch?
A: A manual switch requires someone on site to physically operate the changeover during an outage, while an ATS senses the mains failure and performs the entire start, transfer and re-transfer sequence on its own, which is essential for unattended or after-hours sites.
Q: Can the ATS panel be built for outdoor installation or harsh environments?
A: Yes. Enclosures can be upgraded to higher IP ratings with weatherproof seals, corrosion-resistant coatings and alternative cable entry arrangements for outdoor, coastal or dusty industrial sites.
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