A switch is generally used for two purposes:
1) A disconnecting means for a service entrance
2) A disconnecting means and fault protection for motors
A safety switch is simply a switch located in its own enclosure. The enclosure provides a degree of protection to personnel against incidental contact with live electrical equipment. It also provides protection to the enclosed equipment against specific environmental conditions. Safety switches may consist of a switch only, or may consist of a switch and fuses. There are two families of Siemens safety switches: general duty and heavy duty.
Safety switches can be used in any number of applications.for example, requires that a disconnecting means shall be located in sight from the motor location and the driven machinery location.Regardless of where the safety switch is used, the function is to provide a means to connect and disconnect the load from its source of
electrical power.
With power removed the operator can safely service the machinery without coming into contact with live electrical components or having the motor accidently start.
A switch with no associated fuses is referred to as a non-fusible safety switch. A non-fusible safety switch has no circuit protection capability. It simply provides a convenient means to open and close a circuit. Opening the circuit disconnects the load from its source of electrical power, while closing the circuit
connects the load. Circuit protection must be provided by external overcurrent devices such as circuit breakers or fuses.
A safety switch can be combined with fuses in a single enclosure. This is referred to as a fusible safety switch. The switch provides a convenient means to manually open and close the circuit, while the fuse provides overcurrent protection.
1) A disconnecting means for a service entrance
2) A disconnecting means and fault protection for motors
A safety switch is simply a switch located in its own enclosure. The enclosure provides a degree of protection to personnel against incidental contact with live electrical equipment. It also provides protection to the enclosed equipment against specific environmental conditions. Safety switches may consist of a switch only, or may consist of a switch and fuses. There are two families of Siemens safety switches: general duty and heavy duty.
Safety switches can be used in any number of applications.for example, requires that a disconnecting means shall be located in sight from the motor location and the driven machinery location.Regardless of where the safety switch is used, the function is to provide a means to connect and disconnect the load from its source of
electrical power.
With power removed the operator can safely service the machinery without coming into contact with live electrical components or having the motor accidently start.
A switch with no associated fuses is referred to as a non-fusible safety switch. A non-fusible safety switch has no circuit protection capability. It simply provides a convenient means to open and close a circuit. Opening the circuit disconnects the load from its source of electrical power, while closing the circuit
connects the load. Circuit protection must be provided by external overcurrent devices such as circuit breakers or fuses.
A safety switch can be combined with fuses in a single enclosure. This is referred to as a fusible safety switch. The switch provides a convenient means to manually open and close the circuit, while the fuse provides overcurrent protection.
No comments:
Post a Comment