Galvanic Isolator
MTL5561
Features
Simple installation onto standard
DIN railing
Simplified installation and
maintenance using plug-in
connectors.
Input circuit protected against
reverse polarity
Supports two zones
Description
Model MTL5561 is a zone-powered, two-channel interface for use in conventional fire
detection systems for protection within hazardous areas.
In operation, the triggering of a detector causes corresponding change in the safe-area
circuit. The unit has reverse input polarity protection, while 'non-fail' earth fault
detection on either line can be provided by connecting an earth leakage detector to
terminals 3 or 6. Certified for use in Zone 0, IIC, T4-6 hazardous areas.
Specification
Ordering Code MTL5561
Maximum voltage of Zener diode when fuse 28 V
blows
Minimum value of terminating resistor 300
Maximum short-circuit current 93 mA
Number of channels 2
Current Range 1 to 40 mA, nominal
Settles to within 5% of final value within
Response Time to step input
1.5 ms
Maximum Output Voltage in hazardous area 28 V (from 300 )
Transfer Accuracy at 20C Better than 400 µA
<40 µA/ C (0 C to 60 C),
Temperature Drift
<15 µA/ C (-20 C to 0 C)
Loop Supply Voltage 6 to 30 V dc
Quiescent safe-area current at 20C
<400 µA at Vin = 24 V dc per channel
(hazardous area terminals open circuit)
Operating Temperature Range -20 C to + 60 C (continuous working)
Storage Temperature Range -40 C to + 80 C
Maximum Humidity 95%RH - Non Condensing (at 40 C)
Weight (g) / Dimensions (mm) 143 / H124 x W105 x D16
Mounting Methods DX070, SMB-2 or SMB-3 Enclosures
FURTHER INFORMATION: www.mtl-inst.com
Hochiki Europe (UK) Ltd. reserves the right to alter the specification of its products from time to time without notice. Although
every effort has been made to ensure the accuracy of the information contained in this document it is not warranted or
represented by Hochiki Europe (UK) Ltd. to be a complete and up-to-date description.
