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    SKU: MSLC Market: North America Series: MS
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    SKU: MSLC Market: North America Series: MS

    MSLC Sequencing Load Center System

    Sequenced load center for smaller installations with limited wall space.

    The MSLC is a modular sequencing load center that provides automated, one-touch power control for smaller installations using reliable Square D motorized breakers. It is designed for applications with limited wall space, saving redundant hardware costs and simplifying setup for integrators without requiring on-site commissioning.

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    Where To Buy
    The MS Series provides modular sequencing for power control using breaker or relay based panels. Engineered to protect sensitive audio and video systems from damaging inrush currents, these panels ensure a safe, controlled startup and shutdown sequence for all connected equipment.
    Reliable Sequencing, Simplified.

    Control

    Contact Closure

    Breakers

    Square D Motorized

    Sequencing

    Up/Down Standard

    Setup

    No Commissioning

    Protection

    Brownout & Load Shed
    MSLC SYSTEM OVERVIEW

    Simplified power sequencing for compact installations.

    The MSLC Sequencing Load Center provides a cost-effective and space-saving solution for automated power control in smaller venues. Built on the proven reliability of Square D motorized breakers, the MSLC system delivers one-touch sequential power up and down for all connected circuits. It integrates essential protection features like automatic load shedding and brownout shutdown, ensuring equipment safety without complex programming.

    Engineered for simplicity, the MSLC requires no on-site commissioning, reducing installation time and labor costs. It is the ideal choice for projects that need dependable, straightforward power sequencing where a full-scale panelboard is unnecessary or space is at a premium.

    SYSTEM INTEGRATION

    Integrate the MSLC into your facility.

    The MSLC is designed for simple integration with standard control hardware and electrical components.

    Key Switch or Push-Button Stations

    Connect any standard momentary contact closure device for simple, one-touch sequence up and down control.

    Third-Party Control Systems

    Integrates with any automation or control system that provides a dry-contact relay output.

    Emergency Override Systems

    The standard load-shedding input connects directly to fire alarm or emergency power-off systems.

    Square D QO Breakers

    Utilizes reliable, industry-standard Square D plug-on motorized breakers for circuit control and protection.
    CONFIGURATION OPTIONS

    Built to your project’s specs.

    Every MSLC panel is configured for your specific application. Expand each category for available options.
    Available Models

    MSLC panels are available in several configurations to match different service requirements and circuit counts.

    • Single Phase Models: Designed for 120/240V service, with options for main breakers under 100A or over 100A, as well as Main Lug Only (MLO) configurations.
    • Three Phase Models: Built for 120/208V three-phase service, with various main breaker and MLO options to accommodate higher circuit counts.
    • Balanced Power Model: The MSLC 113-12 is specifically designed for balanced power applications common in recording studios and sensitive audio environments.
    Main Breaker and Service

    Panel capacity is determined by the main electrical service rating and whether a main breaker is included.

    • Under 100A Main: Cost-effective panels for smaller systems with lower overall power requirements.
    • Over 100A Main: Panels sized for larger loads, with main breaker options including 150A, 200A, and 225A.
    • Main Lug Only (MLO): For use as a sub-panel fed from an upstream breaker, offering maximum flexibility in system design.
    Control Options

    The MSLC system is controlled via simple and reliable contact closures.

    • Contact Closure Inputs: Standard on all panels for easy integration with key switches, push-button stations, or automation systems for one-touch control.
    • Contact Closure Outputs: Available as an option to provide status feedback to third-party monitoring or control systems.
    FITS ANY SPACE

    Sequenced Load Centers for Smaller Installations

    Choose the MSLC panel that fits your single-phase or three-phase power requirements.
    Required

    MSLC Sequencing Load Center

    Compact, self-contained panels with a sequencer, breakers, and optional main breaker or main-lugs-only configurations.
    WHY LYNTEC

    Intelligent power control, simplified.

    • Built on reliable Square D motorized breakers
    • Simple setup with no on-site commissioning required
    • Integrated brownout and load-shedding protection
    • Energy-efficient design runs cool and lasts long
    FEATURES

    MSLC System Features

    An overview of the capabilities, protections, and design principles built into every MSLC panel.
    CAPABILITIES

    Features

    Automated Power Sequencing

    Provides sequential turn-on and reverse-sequence turn-off for all connected circuits.

    Selectable Step Rate

    A standard selectable delay between sequencing steps allows for system customization.

    Simple Contact Closure Control

    Integrates easily with key switches or third-party control systems via dry contact inputs.

    Automatic Load Shedding

    Standard emergency shutdown capability for life safety system integration.

    Brownout Protection

    Protects sensitive electronics by automatically shutting down the system during under-voltage events.

    Energy Efficient Operation

    Motorized breakers require no holding current to maintain state, reducing energy use and heat.

    No On-Site Commissioning

    Engineered for simple setup, saving significant time and expense during installation.

    Space-Saving Design

    Utilizes a residential-style load center to fit in locations with limited wall space.
    01

    One-Touch Simplicity

    Designed for straightforward operation, the MSLC uses simple contact closure inputs for one-touch system control, eliminating the need for complex programming or on-site commissioning.
    • Standard up/down sequencing
    • Selectable delay step-rate
    • Simple setup saves installation time
    02

    Engineered for Reliability

    Built with industry-standard Square D motorized breakers and integrated protection, the MSLC provides dependable power control and safeguards connected equipment.
    • Automatic load shedding for emergency shutdown
    • Brownout (under-voltage) protection
    • Energy efficient design with no holding current
    03

    Compact and Cost-Effective

    The MSLC’s load center form factor is ideal for applications with limited wall space, providing a full-featured sequencing solution while saving on hardware and installation costs.
    • Reduces redundant hardware
    • Smaller footprint than traditional panelboards
    • Great value for smaller circuit counts
    SPECIFICATIONS

    MSLC System Specifications

    Technical details for control, breaker support, and protection features common across the MSLC family.
    PRIMARY PANELS

    MSLC Sequencing Load Center

    Compact, self-contained panels with a sequencer, breakers, and optional main breaker or main-lugs-only configurations.

    Model Phase Main
    MSLC 113-12 Single-phase Balanced Power
    MSLC 127 Single-phase Main Breaker (<100A)
    MSLC 129 Single-phase Main Breaker (>100A) or MLO
    MSLC 326 Three-phase Main Breaker (<100A)
    MSLC 329 Three-phase Main Lugs Only (MLO)
    MSLC 338 Three-phase Main Breaker (<100A)
    MSLC 341 Three-phase Main Breaker (150-225A) or MLO

    Shared MSLC System Specifications

    These specifications apply across the MSLC family. Detailed electrical ratings vary by model.

    Control & Sequencing

    • Primary Control
      Contact closure inputs
    • Sequencing
      Sequential on, reverse sequence off
    • Step Rate
      Selectable delay standard
    • Outputs
      Contact closure outputs (optional)

    Breakers

    • Platform
      Built on the Square D Powerlink Platform
    • Type
      Square D motorized breakers (plug-on)
    • Poles
      Supports one, two, or three-pole breakers
    • Amperage
      15A, 20A, 30A standard

    Protection

    • Emergency Off
      Automatic load shedding standard
    • Under-Voltage
      Brownout protection standard

    Common MSLC Specs

    • Breaker Compatibility
      Square D plug-on remote control breakers
    • Sequencing
      Sequential on, reverse sequence off
    • Control Input
      Contact closure
    • Protection
      Brownout and load shedding

    Questions or Concerns?

    Let us know, we’re here to help! Contact Us

    PRODUCT SUPPORT

    MSLC System Support

    Find documentation, application notes, and answers to common questions about the MSLC system.
    VIDEOS

    Setup & training video series.

    EPISODE 1 / 5 · 9:27
    Building a Controllable Breaker Panel Part Number
    DOCUMENTS

    Manuals, guides, and factsheets.

    Optional Features
    CASE STUDIES

    Real-world RPC installations.

    View all Case Studies
    FAQ

    FAQs about the MSLC System

    Can bolt-on breakers be used in the MSLC Sequencing Load Center?

    No. The load centers have insufficient room to accommodate bolt-on breakers. The bolt-on tabs require an additional inch between the two breaker rows. If bolt-on breakers are required use the MSP or MSPH Sequencing Panelboards. The MSPs will accept bolt-on or snap-in breakers. The MSLCs only accept snap-in breakers.

    How can I get a Sequencing Load Center with an interrupt current rating higher than the standard 25kAIR?

    Short answer: Replace the standard (25kAIR) QDL main breaker in our MSLC & MSP 341 panels with a QGL main breaker rated at 65kAIR. The model numbers change to MSLCH and MSPH series.

    Long answer: Sometimes a large capacity transformer feeding a sequencing panel will deliver more than 25,000 Amperes to a dead short, requiring a higher main breaker interrupt current rating than the standard 25kAIR (Square D QDL series) offered in our MSLC 341-xx Load Centers. All of the MSP 341 Panelboards have a 65kAIR main breaker (Square D MHG or MJG series) to satisfy this requirement.

    Your MB Motorized Breaker series and BMB Motorized Breaker series only have a 10kAIR rating. What happens if they sustain a 65,000 Ampere capacity short? All of our panels are “Series Rated” by Square D. Example: A Series Rating on a QGL main breaker indicates that the 65kAIR main breaker and 10kAIR branch breaker, QO or QOB, combination have been tested and certified to UL. Both breakers may trip but safety will not be compromised.

    How do I choose the right MSLC model for my project?

    Selection is based on your electrical service (single or three-phase), main amperage rating (e.g., under or over 100A), and total circuit count. Contact a LynTec engineer with your requirements for a specific recommendation.

    I have an MSLC panel and need to add two more circuits than my sequencer boards can handle. Can I double connect two circuits?

    No, not safely. The control relay and its power supply will be overloaded, shortening its life and compromising the performance in a low line voltage situation. But wait… there is a way. If the third board is not fully loaded you can use 2 or 4 circuits from it. Using the auxiliary breaker function, you can swipe the drive capability for 2 or 4 circuits.

    Is on-site commissioning required for an MSLC panel?

    No. The MSLC system is designed for simple setup and does not require a factory technician or specialized programmer for commissioning, which helps reduce overall installation costs.

    Is there a ‘ZipOn’ function for fast system activation, for example, to get an arena paging system online within 15 seconds?

    We never thought of it as a ZipOn, but we can accomplish that function. The MS series modular sequencer flexibility makes this fast turn-on function possible. The MS series STEP RATE may be set at 1/8, 1/4, 1/2 or 1 second. 80 circuits would require two MSP or MSLC 341-48 cabinets. Each cabinet holds up to 41 motorized breakers. Each cabinet has 4 daisy-chained, 6 step sequencer boards. Each step controls two motorized breakers, so we have 24 steps per cabinet. By installing both the 1/4 and 1/2 second STEP RATE jumpers we can set the step rate to 1/8 second. Each of the two cabinets with 24 steps, will take 3 seconds to turn on. (24 steps x 1/8 sec. = 3 sec.)

    By using only 6 of the 15-second design target, there will still be some time that may be used for front end settling by setting the delay between steps 1 and 2 of the first board to 4 or even 8 seconds. A variation would be to turn on each step at 1/4 second with a settling time delay of 2 seconds for a total turn-on time of 14 seconds. (48 steps x 1/4 =12 sec. + 2 sec. settling time = 14 sec.)

    For larger systems, we can turn on up to 5 sequencing systems in parallel to keep the turn-on time to a minimum. For instance: A stadium has a small MSLC panel in the control room with 24 circuits. With a 4 second settling time delay it requires 5.5 seconds to turn on. (12 steps x 1/8 sec = 1.5 sec + 4 sec. settling time = 5.5 sec.) By series-parallel connecting the daisy chain connections to five MSLC/MSP 341-48 panels we can turn on a 229 circuit system in 8.5 seconds. (Front end MSLC = 5.5 sec. + five parallel connected MSLC or MSP 341-48s, each requiring 3 sec. = 8.5 sec. total turn-on time)

    What kind of control does the MSLC support?

    The MSLC uses standard contact closure inputs for control. This allows for simple one-touch operation from a key switch, a momentary button, or a relay output from a third-party control or automation system.

    What protection features are included with the MSLC?

    Every MSLC panel includes standard brownout (under-voltage) protection to safeguard connected equipment and automatic load shedding for integration with emergency shutdown or life safety systems.

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    Need help specifying your load center?

    Our team can help you select the right MSLC model for your circuit count and service requirements. Get a configuration that is simple, reliable, and code-compliant.

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