Source-Changeover Systems Mechanical Interlocking
Schneider Electric offers source changeover systems based on Masterpact MTZ devices.
They are made of up to three circuit breakers or switches linked by an electrical interlocking system that may have different configurations. A mechanical interlocking system must be added to protect against electrical problems or incorrect manual operations. In addition, a controller can be used for automatically control the source transfer.
For implementing the mechanical interlocking two different possibilities are offered:
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interlocking with rods
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interlocking with cables
The following pages present the different solutions for mechanical and electrical interlocking and associated controllers.
Interlocking Two Devices Using Connecting Rods
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Interlocking of two Masterpact MTZ2 or MTZ3 circuit breakers using connecting rods |
The two devices must be installed one above the other.
Available only for Masterpact MTZ2 and MTZ3 devices, all mixed associations between fixed type and drawout type devices are possible.
Installation
This function requires:
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An adaptation fixture on the right side of each circuit breaker or switch.
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A set of connecting rods with no-slip adjustments.
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A mechanical operation counter CDM (required).
The adaptation fixtures, connecting rods, circuit breakers and switches are supplied separately, ready for assembly by the customer.
The maximum vertical distance between the fixing plates is 900 mm (35.4 in.).
Interlocking of Two or Three Devices Using Cables
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Interlocking of two Masterpact circuit breakers using cables |
For cable interlocking, the circuit breakers can be installed either one above the other or side-by-side.
All mixed associations between Masterpact MTZ2 and MTZ3 fixed and drawout type devices are possible.
Interlocking between two Masterpact MTZ2 devices
This function requires:
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An adaptation fixture on the right side of each device.
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A set of cables without slip adjustments.
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A mechanical operation counter CDM (required).
The maximum distance between the fixing planes (vertical or horizontal) is 2000 mm (78.7 in.).
Interlocking between three Masterpact MTZ devices.
This function requires:
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A specific adaptation fixture installed on the right side of each device.
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Two sets of cables without slip adjustments.
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A mechanical operation counter CDM (required).
The maximum distance between the fixing planes (vertical or horizontal) is 1000 mm (39.4 in.).
Installation
The adaptation fixtures, sets of cables and circuit breakers or switches are supplied separately, ready for assembly by the customer.
Installation conditions for cable interlocking systems:
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Cable length: 2.5 m (8.2 ft.)
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Cable bending radius: greater than 100 mm (3.94 in.)
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Maximum number of curves: three
Masterpact MTZ Mechanical Interlocking by Cables
All mixed associations between Masterpact MTZ2 and MTZ3 fixed and drawout type devices are possible.
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Cable Interlocking |
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Vertical |
Horizontal |
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Two devices MTZ2 - MTZ3 |
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Three devices MTZ2 - MTZ3 |
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