Emergency Power Solutions For Commercial and Industrial Facilities
Reliable emergency backup power solutions to protect operations, ensure safety, and meet code compliance.
When emergencies strike or routine maintenance demands a trusted connection to backup power, ESL Power Systems delivers purpose-built manual transfer and generator docking solutions engineered to work where others don’t. Our focus is connecting your facility safely, reliably, and code-compliantly to temporary generators and load-bank systems. What differentiates ESL is our flexibility and expertise in delivering standard and custom-engineered emergency backup power solutions tailored to each application.
Whether you’re preparing for storm events, testing backup systems, or assuring continuity of critical infrastructure, ESL’s emergency power connection solutions protect operations without compromise.
Why Emergency Power?
Downtime isn’t just inconvenient, it’s expensive, unsafe, and potentially non-compliant. From life-sustaining equipment in healthcare settings to mission-critical industrial systems and utility infrastructure, uninterrupted power is essential. ESL specializes in the connection interface between permanent systems and the temporary power sources that keep them running, especially where safety and maintainability matter most..
Reliable emergency backup power helps you:
- Avoid operational disruptions and lost revenue
- Meet NFPA, NEC, and local emergency preparedness requirements
- Protect sensitive equipment and preserve data integrity
- Ensure the safety and comfort of staff, residents, or tenants
Explore how our custom emergency power solutions can be tailored to your facility.
ESL Emergency Power Products
We manufacture UL/cUL 1008 Listed manual transfer switches and generator docking stations designed for rapid deployment, safe operation, and long-term durability.
Our lineup includes:
Manual Transfer Switch – StormSwitch®
StormSwitch is a manual transfer switch that is UL/cUL 1008 Listed to 3000A and provides an economical commercial solution for businesses that want to be prepared for emergency power loss. Equipped with safety-interlocks and color-coded cam-style receptacles, ESL’s patented StormSwitch ensures a safe and simple hook-up to a portable power generator during a power outage.
3-Way Manual Transfer Switch – TripleSwitch®
Our 3-way manual transfer switches range up to 3000A and are UL/cUL 1008 Listed. ESL’s TripleSwitch uses three interlocked disconnects to isolate standby generator circuits during COPS (Critical Operation Power Systems) load bank testing. The unique design also provides a quick, safe method to connect to a portable generator for redundant backup power
Dual Purpose Docking Station – DualConnect™
For emergency backup system designs with either multiple or existing generators, ESL’s UL 1008 Listed DualConnect™ – Dual Purpose Docking Station (DPDS) provides the flexibility needed to meet your design criteria. ESL’s Dual Purpose Docking Station offers the ability to connect a load bank and portable generator at the same time and is UL 1008 Listed from 400A – 5000A.
Automatic Transfer Switch with Cams – ReadyConnect™
ESL’s ReadyConnect™ Automatic Transfer Switch (ATS) with Cams is UL/cUL Listed pending from 30A-400A and available up to 1200A. ReadyConnect provides the ability to proactively connect back-up power before planned outages. This ensures maintenance workers are not required to be on site for power to be switched from one source to another and then restored.
Portable Generator Connection Box – TempTap™
ESL’s generator connection boxes are UL/cUL 1008 Listed up to 3200A. TempTap inlet boxes provide end users with a safe and simple solution to connect a portable generator to a facility with an existing manual or automatic transfer switch. Once installed by a licensed electrician, temporary connection to a portable generator is easy with color-coded cam-style receptacles.
Outlet Distribution Unit – OutTap™
ESL’s outlet distribution units range up to 5000A and are simple pass-through boxes that are mounted to the exterior of a building and wired to an existing power source. These boxes can be designed with or without a breaker based on your facility needs, and provide operators with color-coded female cam-style receptacles to ensure a quick and safe connection.
All ESL products are designed specifically to handle the real-world challenges of connection, test, and emergency scenarios where generic switchgear isn’t optimized. Looking for technical specs or examples? Browse our Emergency Power Product Catalog for a look at available configurations.
Don’t Let the Next Outage Catch You Off Guard
Power failures risk more than downtime they threaten safety, compliance, and your bottom line. ESL’s emergency power solutions are built to keep critical operations running when it matters most.
Code Compliance Without the Red Tape
Navigating emergency power code requirements can be complex. ESL designs every solution to help your project pass inspection the first time minimizing risk, ensuring safety, and keeping timelines on track.
Our solutions are built to meet or exceed common regulatory standards such as:
- NFPA 70 (NEC)
- NFPA 110
- UL 1008 Transfer Equipment Standards
- OSHPD Seismic Certification (OSP)
For peace of mind and inspection-readiness, ESL offers clear labeling, test provisions, and integrated safety features.
Why Emergency Power with ESL?
A proven power partner—trusted where it matters most.
With decades of experience, ESL has delivered critical power solutions to thousands of facilities across North America. Our systems are designed to perform when lives, data, and infrastructure depend on them.
A solution built for performance, not shortcuts.
From rugged construction to intuitive safety features, every ESL product is made to simplify testing, reduce maintenance, and meet the demands of real-world emergencies. We engineer with the end-user in mind because that’s who it matters to most.
A team that knows emergency power isn’t optional.
From healthcare environments to large-scale infrastructure, our team understands the operational and compliance pressures facilities face. Whether you’re planning new construction or upgrading existing systems, we’re here to help you get it right.
Frequently Asked Questions
Emergency power provides backup electricity during a utility outage to keep critical systems operational. Facilities like hospitals, data centers, water treatment plants, and public buildings are required by code (NFPA 70 NEC 700, NFPA 110) to maintain power to life-safety systems and essential infrastructure. Emergency power ensures code compliance, occupant safety, and uninterrupted operation of mission-critical systems.
ESL emergency power products are UL/cUL 1008 Listed (Transfer Equipment Standard) and designed to meet NFPA 70 (NEC Article 700), NFPA 110 (Emergency and Standby Power Systems), and UL 1008. ESL also complies with OSHPD Seismic Certification (OSP) for applicable healthcare projects. All products are Made in the USA.
A UL 1008 manual transfer switch (MTS) requires an operator to physically switch a facility from utility to generator power, and back again once utility power is restored. A UL 1008 automatic transfer switch (ATS) detects the outage and switches sources on its own, without anyone on site. For code-driven applications like NEC 700.3(F) legally required standby systems, facilities typically need one or the other rated to the full facility load. ESL manufactures both: StormSwitch® and TripleSwitch® for manual applications, and ReadyConnect™ ATS for automatic or pre-scheduled switching.
A generator docking station, or tap box, is a pass-through connection point — typically a UL 1008 Listed enclosure with cam-style receptacles — that lets a portable generator connect to a facility’s existing transfer switch or utility disconnect. Unlike a transfer switch, a tap box doesn’t switch power sources itself; it’s the safe connection interface between the temporary generator and the permanent switching equipment already installed. ESL’s TempTap™ is UL/cUL 1008 Listed up to 3200A.
ESL emergency power products cover a wide range: StormSwitch® and TripleSwitch® manual transfer switches are rated up to 5000A (UL1008 Listed up to 3000A); TempTap™ generator connection boxes up to 3200A; ReadyConnect™ ATS from 30A–400A standard (up to 1200A); and DualConnect™ and OutTap™ from 400A–5000A. Custom configurations beyond these ranges are also available.
Yes. All ESL emergency power products — including StormSwitch®, TripleSwitch®, TempTap™, DualConnect™, ReadyConnect™, and OutTap™ — are Made in the USA and UL/cUL 1008 Listed (Transfer Equipment Standard), designed to meet NFPA 70 (NEC Article 700), NFPA 110, and OSHPD Seismic Certification (OSP) where applicable.
Yes. ESL designs and manufactures both standard and custom-engineered configurations tailored to site-specific requirements, working closely with engineers and facility teams to meet operational and compliance needs. Visit eslpwr.com/request-a-custom-consultation or call (800) 922-4188 to get started.
Request a quote through your local ESL representative at eslpwr.com/local-reps, or call (800) 922-4188 or email info@eslpwr.com. For custom solutions, visit eslpwr.com/request-a-custom-consultation.
Keep Critical Systems Online Without the Headaches
Whether you’re planning ahead or responding to an urgent need, ESL delivers reliable, code-compliant emergency power solutions backed by expert support from spec to install.
ESL Complies with NFPA’s NEC® 700 provisions for legally required systems. Click to Learn More
