Description
Unboxing & Hardware Overview
- Manufacturer & Brand: MTL / Eaton (Crouse-Hinds series)
- Part Number / Model: SDRTD (Part of the ultra-slim SD process instrumentation surge protection portfolio)
- Product Type: Specialized 3-Wire Resistance Temperature Detector (RTD) Surge Protection Device (SPD)
- Physical Dimensions: Ultra-slim space-saving modular form factor (approx. 7 mm width) designed for standard DIN-rail mounting
- Estimated Shipping Weight: ~0.15 lbs (0.07 kg) packaged with protective anti-static materials
- Primary Condition Status: Factory New / New Surplus / Refurbished Tested options available (verify specific lot status with provider prior to dispatch)
Product Introduction
The MTL SDRTD is an ultra-slim, high-density surge protection device engineered specifically to safeguard sensitive 3-wire RTD (Resistance Temperature Detector) measurement loops and associated temperature transmitter inputs. Part of MTL’s trusted SD range, it provides multi-stage hybrid protection against transient overvoltages and high-energy surges caused by lightning strikes or heavy industrial switching on long field cabling runs.
The device delivers robust surge diversion while introducing minimal series resistance per line, preserving the high accuracy and measurement fidelity required for critical industrial temperature monitoring systems.
Core Technical Specifications
| Parameter | Value |
| Product Model | SDRTD |
| Nominal Operating Voltage (V_{dc} / V_{ac}) | 1 VDC / 0.75 VAC (Max Continuous Operating Voltage: 5 V) |
| Max Discharge Current (I_{max}) | Up to 5 kA (8/20 µs waveform) |
| Series Resistance | 2.7 \Omega per line |
| Max Leakage Current | < 0.3 µA (to prevent measurement offset) |
| Voltage Protection Level | < 12 V (at 1 kV/µs impulse) |
| Signal Bandwidth | 50 MHz |
| Mounting Type | T-section DIN-rail (35 x 7.5 mm or 35 x 15 mm rails) with automatic earth connection |
| Operating Temperature | -40°C to +80°C (-40°F to 176°F) |
| Storage Temperature | -40°C to +85°C (-40°F to 185°F) |
| Relative Humidity | 5% to 95% non-condensing |
Compliance & Standards Alignment
- Designed to meet international industrial immunity and surge protection guidelines for sensitive instrumentation loops.
- Certified for hazardous area deployment (including ATEX / IECEx Zone 2 compliance as “simple apparatus” depending on system loop configuration) without degrading intrinsic safety parameters.
Technical Note: The SDRTD is designed explicitly for 3-wire RTD configurations. Ensure that field-side sensor lines and control-side instrumentation lines are wired strictly to the designated input and output terminals to maintain correct low-resistance balancing across all three legs.
Storage & Asset Preservation Guidelines
- Keep the surge protector sealed inside its original anti-static packaging to protect internal solid-state suppression components from environmental dust and humidity.
- Store in a temperature-controlled environment with relative humidity maintained strictly below 60%.
- Avoid dropping or subjecting the slim housing module to heavy mechanical shock prior to cabinet installation.
Physical Installation Prerequisites
- Ensure the temperature measurement loop is powered down or follow plant safety procedures before installing or swapping protection modules.
- Snap the device directly onto a grounded top-hat DIN-rail; the module features an integrated grounding foot that establishes a low-impedance path to the rail upon mounting.
- Verify that all three RTD leg connections match the device pinout configuration to prevent introducing bridge-circuit measurement imbalances.
Buyer’s FAQ & Logistics
Q: What Harmonized System (HS) code applies to this RTD surge protector?
A: Electrical surge suppressors and signal protection devices typically classify under HS code 8536.30 (apparatus for protecting electrical circuits). Confirm final classification parameters with your licensed customs broker.
Q: Does the SDRTD require an external power supply?
A: No, the SDRTD is a passive multi-stage protection component driven entirely by the loop signals and requires no external power source.
Q: Is the listed online price final for procurement?
A: Note: Price is subject to market conditions and available surplus inventory levels; contact our technical sales desk for a formal, time-sensitive quotation.
