Schneider’s Square D Safety switches are vital components to safety and power control. They are a means to disconnect from the electrical load and provide protection to the branch circuit.
When necessary, they can be used to disconnect manufacturing equipment, heavy machinery and light commercial and residential applications from its power source. Users may need to disconnect equipment from its electrical supply for a variety of reasons from scheduled preventive maintenance to emergency stoppage.
The performance of safety switches is important to the safe operation of many industrial applications. In addition, requirements from a variety of organizations have increased the use of safety switches in many commercial and industrial facilities.
In addition, safety switches are an NEC requirement in industrial and manufacturing facilities. For instance, a safety switch must be in sight from all motors or manufacturing equipment and not more than 50 feet from the equipment it controls.
A key performance benefit of the Schneider safety switch is its ability to break load. A locked motor can draw six to eight times motor full-load current. In an emergency situation, it’s important to have a safety switch with enhanced load-break features such as those featured in Schneider’s switches. A key element of Square D safety switches is its blade and jaw construction that has been designed to manage heavy motor loads and arc interruptions.
Multiple types of disconnect switches are available, and the switch that work for you depends on a number of factors in your working environment. Steiner’s expertise can help make the appropriate choice. Steiner stocks a large inventory of safety switches ready for pickup at one of our convenient locations or on-time delivery to your facility or job site, including: general duty, heavy duty and double throw switches in single and multiple pole, fusible and non-fusible.
Here is a look at some of the most common safety switches.
General Duty Safety Switch
One of the most go-to safety switches are those that are considered General Duty (GD) safety switches. These are designed for residential and commercial applications and where durability and economy are prime considerations. Typical loads are lighting, air conditioning, and appliances. They are suitable for use as service equipment when equipped with a factory or field-installed neutral assembly or a field-installed service grounding kit as applicable.
- Voltage: Maximum voltage of 240 V
- Current Rating: Max amperage of 800 A
- Enclosure: Available in Type 1 and Type 3R enclosures
- Certification: UL Listed, File E2875
- Standard: Meets or exceeds the NEMA Standard KS1
Heavy Duty Safety Switch
Visible blade heavy duty safety switches are designed for applications where maximum performance and continuity of service are required. All heavy duty safety switches feature a quick-make, quick-break operating mechanism, a dual-cover interlock and a color-coded indicator handle.
- Voltage: Maximum voltage of 600 V (ac/dc)
- Current Rating: Max amperage of 1200 A
- Enclosure: Available in Type 1, Type 3R, Type 4, Type 4X, Type 5, Type 7, Type 9, Type 12 and Type 12K enclosures
Double Throw Safety Switch
Double throw safety switches are designed for manual transfer of one load between two power sources. The units are tough and reliable to provide emergency back-up power connections in accordance with Article 702 of the National Electrical Code, ANSI/NFPA 70.
- Voltage: Maximum voltage of 600 V (ac/dc)
- Current Rating: Max amperage of 600 A
- Enclosure: Available in Type 1, Type 3R, Type 4, Type 4X, Type 5 and Type 12 enclosures
Make Selections EZ
These safety-switch options, and others that are more specific in application, come with multiple options such as various difference in amperage and voltage. In some cases, the question is whether to use fusible or non-fusible switches. Fusible safety switches combine fuses with the switch in a single enclosure. For both fusible and non-fusible safety switches, when the circuit is open, the safety switch disconnects the load from its source of power, while closing the circuit reconnects the load.
With all the product variables from application to enclosure type, voltage to amperage applications, selecting the appropriate safety switch can be a challenge. Schneider Electric has made the process simpler by developing the EZ Selector system.
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 Safety Switches.