Switches • Safety Switches

Safety switches can be used in a wide range of applications to turn off machinery and systems in emergency situations.

Generally tasked with preventing the operation of a machine in the case of a potential hazard, safety switches are designed to work with hinged, sliding, or lift-off guards and barriers.Within a factory that features industrial machinery, a safety switch is required to install a locking system for the drive of each machine. The locking system operates when a machine’s door is not closed completely, and prevents accidents in which an operator may get caught in the machine. A safety switch may also be installed within an electronic device to prevent the device’s housing from being opened and touched by an unauthorized third party.Safety switch types: non-contact interlock, safety limit, pneumatic interlock, tongue interlock, explosion proof, guard-locking interlock, hinge pin-operated interlock, rope-operated emergency stop, non-contact magnetic interlock, solenoid-actuated guard-door locking. 

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  • SICK, Inc.

    SICK manufactures both electro-mechanical and non-contact safety switches. The electro-mechanical types come in four groupings: separate actuators, locking devices, position switches, and safety hinge switches. Up to four total positive opening contacts are available on the switches, which are made of either plastic or metal.

  • Euchner-USA, Inc.

    Euchner-USA offers safety switches in both design type 1 with integrated actuator, and type 2, with separate actuator. Type 1 safety switch options include the NM Series, which is plastic with two narrow body designs, up to three contacts, and six different actuator heads. Type 2 safety switches are differentiated by those with locking and those without.

  • Honeywell Sensing and Control

    Honeywell Sensing & Control offers Micro Switch safety switches in every size for both end users and OEM. Options include miniature switches (<50 mm) for smaller doors and openings, trapped key and solenoid key switches for large, heavy doors, cable pull switches for conveyor or perimeter guarding, and non-contacting switches for small door position detection. These switches, made from everything from plastic to die-cast zinc, provided mechanical life from 1 million up to 15 million, cable length as long as 10 m (prewired), and ampere rating ranges from 1 to 100 mA low energy, to 50 mA to 10 A thermal.

  • Omron, STI Safety - Scientific Technologies, Inc.

    Omron carries an array of safety switches designed to work together with hinged, sliding, or lift-off guards and barriers; when the guard is opened, the power supply to the machine is disconnected.  They offer both compact and non-compact rope pull safety interlock switches for mounting widths as small as 40 mm, rated to IP67 (NEMA6), and rope spans up to 200 m. Guard door locking safety switches are also available.

  • Square D Co.

    Schneider Electric provides safety switches for light to heavy duty, as well as a variety of specialized models. General duty safety switches for residential and commercial applications (e.g. lighting, air conditioning, appliances) are available fusible and non-fusible, and 30-800 A rated for application loads up to 240 V. Light duty safety switches are available in three single-phase styles with a 30 A maximum rating, while heavy duty switches cover a range from 30-1,200 A with a 240 or 600 Vac maximum.

  • Schmersal, Inc.

    Schmersal offers a full line of point of operation machine guarding products, such as keyed interlock switches, hinged interlock switches, and safety-rated limit switches. Safety-rated limit switches include the Z/T235, which is available with a choice of six standard actuators that are mountable in any of four 90-degree positions, and the Z332, which is housed in rugged metal and IP65 rated.

  • Pilz Automation Safety L.P.

    Pilz offers five lines of safety switches for gate and position monitoring. PSENmech mechanical safety switches use increased extraction force on actuators to ensure that gates cannot be opened unintentionally, while PSENmag switches use non-contact, magnetic technology to monitor the position of movable guards and other objects.

  • EE Controls

    EE Controls specializes in safety interlock switches, rope pull switches, and other machine safety switches to protect personnel from hazardous machinery. Interlock switches are available with NEMA 4- or 12-rated thermoplastic bodies with door-holding force ratings of 2, 7, or 22 lbs., or with metal bodies with up to 23 lbs. of holding force.

  • Leuze Electronic, Inc.

    Leuze Electronic manufactures four series of safety switches. The S20 safety switch comes without guard interlocking, and is made of fiberglass-reinforced plastic in accordance with IP67. As with all the company's safety switches, its contact sets are suited for integration up to category 4, according to EN ISO 13849.

  • Unimax Switch

    Unimax has been manufacturing interlock and safety switch devices for over 25 years. The SAF captive key interlock safety switch provides guard inhibitive locking, suitable for removable, hinged, or sliding guards; both lock and enclosure are sealed to IP65 standard. The GW captive key safety interlock locks the guard closed while the machine is running, and switches power off before the guard can be opened.

  • Moeller

    Moeller Electric provides an array of safety switches and related technology. Door safety switches for protecting personnel include the hinge-operated LSR/TS and hasp-operated LSR/TKF, which have a registered opening at 5 degrees, and the LS-ZBZ, which has magnet- or spring-powered interlocks.

  • Allen-Bradley, a Rockwell Automation Brand

    Allen-Bradley offers interlock, trapped key, and safety limit safety switches. The interlock switches come in tongue interlock, guard locking, non-contact, and hinge configurations, and offer different options on how the switch can be operated and mounted on the guard. Safety limit switches are available in two styles: IEC or NEMA.

  • Allied Electronics, Inc.

    Allied Electronics sells safety switches from a long list of manufacturers, including STI, Microswitch, Banner Engineering, Hermetic Switch, and Omron. Products come in an assortment of contact forms, from 1 NC/NO to 2NC/1NO BBM; various voltage and current ratings; mounting types such as DIN rail, door, and panel; and termination options like cable, M16 + NPT adapter, M20 + NPT adapter, and screw. Many switches also come IP66 or IP67 rated, and RoHS compliant.

  • IDEM Safety Switches Ltd

    IDEM specializes in safety interlock switches, including tongue, solenoid locking, rope, non-contact, and explosion-proof ATEX switches. Mechanical interlock switches include Kobra tongue switches in three types: KM provides 3 or 4 pole contact blocks and die cast metal housing; KP offers 3 features entries and polyester body, as well as explosion-proof contact block versions; and IDIS-1 is a compact version with positive opening safety contacts to IEC 947-5-1. Additionally, the hinged IDIS-2 provides 180-degree contact operation at 5 degrees, a rugged plastic body, and metal enclosure protected to IP66/67. For most models, conduit entries are fitted to M20 or 0.5".

  • ABB

    ABB features safety switches to cover a spectrum of power ranges. These manual switches, which are padlockable in the off-position, are designed to be mounted near motors or machines to isolate main circuits and prevent accidental start of electrical machinery, especially during maintenance and repair situations. Choices include 3-, 4, and 6-pole switches enclosed by plastic, steel, stainless steel, aluminum, or acid proof materials, in addition to EMC and ATEX-approved models.

  • Inertia Switch, Inc.

    Inertia Switch provides safety switches for a variety of applications, including crash and impact detection, power cessation, disturbance, imbalance, and miscellaneous safety systems. Switches come with an array of features, from axes that are unidirectional, radial, or omnidirectional , to solid wire or Teflon wire leads, to latching or momentary responses. Current requirements are either 1 or 2 amps, and contact type can either be S.P.S.T. NO or NC.

  • Boltswitch, Inc.

    Boltswitch offers switches designed to ensure safe operation of devices and accompanying personnel. Enclosed battery disconnect switches range from 200 to 1,200 amps, for use with DC rated Class T fuses, particularly for telecommunication applications. Their double break design also provides complete isolation of the fuse from the battery and rectifier circuits. In addition, the company's heavy duty enclosed switches are rated from 400 to 1,200 amps, 240 and 600 volts AC, and suitable for use on a circuit capable of delivering up to 200,000 RMS.

  • Microprecision Electronics Inc.

    Microprecisions' MP800 series safety switch is designed for a wide array of industrial applications and comes with a choice of plastic or metal housing in the following sizes; 30 mm, 40 mm or 50 mm. This switch features a forced break switch with slow or snap action.

  • Norstat Inc.

    Norstat's line of safety switches in a wide array of model types including plastic safety interlock switches, metal safety interlock switches, solenoid locking safety switches, safety rope pull switches and emergency stop switches.