Schneider Electric manual starters and switches are compact and elegantly designed devices that are primarily used to switch motors ON/OFF. Despite their simplicity, they can reverse the motor depending on the model and protect the motor against overloads, shorts, and phase failures in fuse-less applications. These devices, which are typically operated by toggle or push button, come in a variety of options from reversing and non-reversing to multi-speed choices.
Steiner stocks a large inventory of manual motor starters and switches for pickup at one of our convenient locations or on-time delivery to your facility or job site, including fractional horsepower manual starters with melting alloy overload relays; manual switches that are horsepower rated for self-protected motors; and manual starters with integral horsepower with melting alloy overload relays.
It is now easier to configure the right motor starter and switch for your application by using the Schneider EZ Selector. When it comes to manual starters and switches, the EZ Selectors make it especially easy to choose from various versions and multiple options of (type F) fractional starters, (type K) manual switches, and (type M, T) starters with melting alloy overload relays.
Manual starters are designed for low horsepower motor applications. In fact, many small motors use a fraction of a horsepower to run, and Schneider offers manual starters designed specially for these fractional horsepower motors.
The starters are especially suited for being mounted directly onto or near the machine that is controls. They can be used as stop-starts without the need to run extra power cords and wires.
The starters can be chosen based on the type of electronic to be controlled and protected. Is the application a single-phase or three-phase? What is the full-load amperage? Does your application require 1 or 2 pole configurations or 2 or 3 pole configurations?
The environment in which they are to operate is also a primary concern. Some starters must be dust proof or be oil resistant. If a dusty environment, the starter might require a NEMA 12 enclosure that will protect against dust, dirt, and dripping non-corrosive liquids, oil and lubricants. A NEMA 4 enclosure is often intended for outdoor use where extra protection against moisture and wind driven rain is required.
Some models are available in specific NEMA enclosures. Type F fraction HP starters are available in NEMA Type 1 enclosures (oversized and flush-mount enclosure option available), Type 4 enclosures (with zinc alloy die casting), and NEMA Type 3R, 7 and 9 (cast aluminum enclosure).
Various models also have specific operators. For instance, for Type M and T integral horsepower starters, a push button or toggle operator is available in open and NEMA Type 1 enclosure, while a direct acting push button is only available on NEMA Types 4 and 12 enclosures.
Thermal overload is also a consideration to protect a motor against overheating. For example, the ambient temperature of a cabinet with multiple electronics could become so hot that nuisance tripping occurs.
To solve these problems, many switches, such as the Type M and Type T units, feature melting alloy thermal units. Depending on the thermal load, these starters might necessitate their thermal overload protection adjusted for the heat (See video below). The thermal overload protection developed by Square D has a special alloy in it. When the ambient temperature reaches a certain level, the protective relay undergoes a phase change from solid to liquid and shuts off the motor. This greatly reduces the chance of motor damage.
These considerations are just a few options that must be taken into account when choosing the correct manual starter or switch for the particular application.
Fractional Horsepower Manual Starters
Type F fractional horsepower starters provide overload protection as well as
manual ON/OFF control for small motors in a variety of industrial and commercial installations including fans, conveyors, pumps, and small machine tools. Available in enclosed or open styles, they come in in non-reversing and two-speed versions to control small single-phase AC motors that have separate windings for high- and low-speed operation.
- Horsepower rated up to 1hp AC, 0.75hp DC
- Overload protection provided by melting alloy thermal units
- Available in 1 or 2 pole configurations for AC single phase motors rated up to 1 hp. Two-pole starters can also be used with DC motors rated up to 0.75 hp.
- 277VAC Max, 230VDC Max (2-pole only)
Manual Starting Switches
Type K starting switches , which use two switches (one to connect the motor for forward rotation and one for reverse rotation), provide manual ON/OFF control of single- or
three-phase AC motors, and also for reversing AC motors where overload protection is not required or is provided separately. They are suitable with three-phase squirrel cage motors. The type K 2-speed manual switches may be used with separate winding three- or single-phase AC motors.
Available in enclosed or open style, with compact construction and a 600 V rating, these switches are suitable for a wide range of industrial and commercial uses including small machine tools, pumps, fans, conveyors, and other types of electrical machinery. They can also be used on non-motor loads such as resistance heaters.
- Available in reversing, non-reversing, and two-speed versions
- Horsepower rated up to 20hp AC, 2hp DC for self-protected motors
- Available in 2 or 3 pole configurations
- 600VAC Max, 230VDC Max
Integral Horsepower Manual Starters
Designed for overload protection and manual ON/OFF control for small single phase, polyphase or DC motors, the Type M and T Integral horsepower starters are available in NEMA sizes M0 – M1, and come with either Push Button (M) or Toggle (T) operators. Options include non-reversing, reversing, and two-speed applications. Typical applications include small machine tools, pumps, fans, and conveyors.
- Pilot light and auxiliary contact available
- Horsepower rated up to 10hp AC (3-phase), 5hp AC (Single-phase), 2hp DC
- Available in 2 or 3 pole configurations
- 600VAC Max, 250VDC Max (2-pole only)
- Available in enclosed or open style
Make Selections EZ
Manual starters and switches come with multiple options. With all the product variables from application to enclosure type, voltage to amperage consideration, selecting the appropriate starter or switch can be a challenge. Schneider Electric has made the process simpler by developing the EZ Selector tool.
The EZ Selector tools ask simple “click-to-answer questions,” and the user is self-guided through a process that ultimately leads to the right product for the application.
Order online or call 1-800-STEINER (783-4637) to speak with a Steiner sales representative for more information on Schneider Square D Manual Starters and Switches.