MD301Ex THORN 20VDC 1W Intrinsically Safe Heat Detector

Description

THORN MD301Ex (Part No. 516.023.002) is a 20 VDC, 1 W intrinsically safe rate-of-rise heat detector featuring a lightweight 0.050 kg ABS construction. Engineered for 2-wire operation, the unit utilizes a thick-film hybrid circuit with NTC thermistors printed on a ceramic substrate for precise thermal tracking. It operates with a maximum safety voltage of 28 VDC, an equivalent capacitance of 1.5 nF, and zero equivalent inductance, mounting seamlessly via the M300 conventional base.

MD301Ex Specifications
Manufacturer: THORN Security (Tyco)
Model Number: MD301Ex
Part Number: 516.023.002
Series: MD300 Ex Series
Product Type: Intrinsically Safe Heat Detector
Detection Method: Rate-of-Rise (R-O-R)
Response Grade: Grade 1
Nominal Operating Voltage: 20 VDC
Maximum Safety Voltage: 28 VDC
Maximum Power Input: 1 W
Equivalent Inductance: 0 mH
Equivalent Capacitance: 1.5 nF
Weight: 0.050 kg
Enclosure Material: ABS
Startup Time: 10 seconds
Wiring Configuration: 2-Wire
Compatible Base: M300 Conventional Base
Sensor Technology: NTC Thermistors on Ceramic Substrate
Intrinsic Safety Certification: E Ex ia IIC T5
Standard Compliance: BS5445:Pt 5, EN54 Pt 5, BS5501: Pt 7, EN 50 020

MD301Ex Applications
Primary applications include integration into marine fire detection panels, offshore oil rig safety systems, and hazardous area monitoring networks. Deployed within machinery spaces, engine rooms, and volatile chemical processing facilities requiring ATEX-certified E Ex ia IIC T5 thermal monitoring.

Additional information