Description

SDRTD MTL
Brand: MTL Instruments (Eaton Crouse-Hinds)
Model: SDRTD
Product Name: 3-Wire RTD Surge Protection Device (SPD), SD-Series
Dimensions: 99 mm × 7 mm × 101.3 mm (3.90 in × 0.28 in × 3.99 in)
Weight: approximately 0.07 kg (0.15 lbs)
Country of Origin: United Kingdom
HS Code: 85363000 (surge protective device for signal circuits, for reference only)

SDRTD

Input Specifications
Field-side input interfaces accept 3-wire RTD sensor signals with resistance ranging from 10 Ω up to 1500 Ω. Nominal operating input voltage is 1 VDC / 0.75 VAC, maximum continuous operating voltage (MCOV) equals 5 V. Normal loop operating current is less than 10 mA per channel. Maximum surge discharge current reaches 5 kA (8/20 µs waveform). Each signal line carries 2.7 Ω series resistance, and maximum leakage current stays below 0.3 µA to avoid measurement offset. Terminals accommodate wire gauge from 12 AWG to 22 AWG for field instrument cabling.
Output Specifications
Control-side output passes protected RTD resistance signals towards DCS or PLC analog input modules. The voltage protection level is lower than 12 V at 1 kV/µs surge impulse, residual voltage equals 38 V under rated surge current. Signal bandwidth reaches 50 MHz to preserve integrity of slow RTD measurement signals. No signal amplification or conversion is performed; the device only suppresses surge transients and transfers raw resistance-based measurement signals to backend control hardware.
Key Features
Ultra-narrow 7 mm housing saves cabinet installation space and allows high-density multi-module stacking on standard 35 mm DIN-rail. Multi-stage hybrid surge-suppression circuit architecture delivers reliable transient-energy diversion. Certified for ATEX, IECEx Zone 2 hazardous-location application, also complies with UL and CE industrial standards. Operating ambient temperature ranges from -40 °C to +80 °C; storage temperature spans -40 °C to +85 °C. Relative humidity rating is 5%-95% non-condensing. Enclosure protection grade IP20 for cabinet-mount usage. It supports 3-wire RTD loop configuration and maintains high-fidelity low-level measurement signal transmission. No external power supply is required for operation. This SPD cannot perform temperature measurement independently; it must be installed in series within RTD sensor loops between field sensors and control-system I/O cards.

SDRTD: SDRTD

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