MTL SD range of MTL MD32X Ultra-slim user-friendly devices for protecting electronic equipment and systems against surges on signal and I/O cabling.
The SD range is a series of surge protection devices combine unparalleled packing densities, application versatility, proven reliable hybrid circuitry, simple installation and optional ‘loop
disconnect’ facilities – features which make the range the ultimate surge protection solution for process equipment, I/O systems and communications networks. The exceptionally high packing densities are the consequence of an ultra slim ‘footprint’ for individual modules which can thus ‘double-up’ as feedback terminals. Each module provides full hybrid surge protection for 2 and 3 wire loop protection. Modules with a comprehensive range of voltage ratings cover all process related signals such as RTDs, THCs, 4 to 20mA loops, telemetry outstations, shut-down systems and fire and gas detectors.
Optional ‘loop disconnect’, is a feature which allows commissioning and maintenance to be carried out without removal of the surge protection device. This facility is provided
by the SD07, SD16, SD32 and SD55 units. In addition, a third connection on the field and safe side of the protector is provided in order to terminate screens safely.
For three wire applications the specially designed SDRTD (Resistance Temperature Detector) and the SD32T3, (for separately powered 4-20mA loops) provide full 3-wire protection in a single
compact unit. The recommended choice for the protection of 3-wire pressure transducers on low power circuits is the SD07R3.
For higher bandwidth applications, the SDR range has been developed to meet the demands of today’s highest speed communication systems. 120V and 240V AC versions are available for I/O and power
supplies up to three Amps of load current and telephone networks can be protected by the SDPSTN.
One simple manual operation clamps modules securely onto DIN rail, which automatically provides the essential high-integrity earth connection.
‘Top-hat’ (T-section) DIN rail is generally suitable for mounting SD modules although for adverse environments, a specially-plated version is available. A comprehensive range of mounting and
earthing accessories can also be supplied, see page 7 for further details.
The SD range of SPDs includes models for almost all possible applications operating at voltages up to 250V AC. The optional ‘fuse/disconnect’ package provides both fused protection against
fault currents and a convenient method of isolating field circuitry from protected circuitry without needing additional disconnect terminals. The standard fuse (which is replaceable) is rated
250mA with 50mA fuses also being available by special request. Where only the disconnect feature is required, solid links can be
As an example, this feature is of particular value in applications in which an SPD is used with a bulk power supply feeding multiple loops. The individual module fuse prevents a fault
or follow on current on one loop disrupting the power supply to the others. Also, loops can be removed from the circuit for maintenance reasons or added without needing additional
disconnect terminals. The following guide to selection suggests the most suitable SDs for a number of specific applications. For technical information, see the detailed specifications on the back page of this publication (some field circuit protection is shown for completeness).
If you need more ABB DO571 Digital output module detail information , please feel free to contact me as below:
Kelly Pan / Sales Engineer
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