MTL5526 Switch operated relay 2–channel IS–output From MTL INST UK, MTL Barrier
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MTL5526 Switch operated relay 2–channel IS–output From MTL INST UK, MTL Barrier
MTL5526 Switch operated relay 2–channel IS–output
MTL5526 enables two separate IS circuits in a hazardous area to be contact controlled by one or two, on/off, control signals in a safe area. Applications include the calibration of strain–gauge bridges; changing the polarity (and thereby the tone) of an IS sounder; the testing of IS fire alarms; and the transfer of safe-area signals into an annunciator with IS input terminals not segregated from each other. The output–relay contacts are certified as non–energy–storing apparatus, and can be connected to any IS circuit without further certification, provided that separate IS circuits are such that they would remain safe if connected together.
SPECIFICATION FOR MTL5526
See also common specification
Number of channels
Two, fully floating
Location of control circuit
Safe area
Input/output characteristics
Contact/Logic mode
(Inputs suitable for switch contacts, an open–collector transistor or logic drive)
Relay energised if < 450Ω or < 1V applied
Relay de–energised if > 5kΩ or > 2V applied (35V max.)
Loop powered mode
Relay energised if >20V
Relay de-energised if <17V
Power supply failure protection
Relays de–energised if supply fails
Response time
25ms nominal
Contacts (suitable for connection to IS circuits)
1–pole changeover per channel
Contact rating
250V dc, limited to 30V dc for IS applications, 2A
(reactive loads must be suppressed)
Contact life expectancy
2 x 107operations at maximum IS load
Relay drive (see switch setting table)
Choice of "loop-powered" or "contact/logic" control, for both
channels, by switch selection. A further switch option ("1in2out")
enables either input, in contact/logic mode, to activate both outputs.
