Description
1. Unboxing & Physical Snapshot
- Model & Brand: MTL (Eaton / formerly Telematic) — SD32X (Ultra-Slim Signal Surge Protection Device)
- Physical Dimensions: Approximately 99 mm x 102 mm x 7 mm (ultra-slim 7 mm width modular profile).
- Estimated Shipping Weight: 0.2 kg (0.4 lbs) packed in individual anti-static containment bags with shock-absorbing inserts.
- What’s in the Box: SD32X surge protection module, integrated automatic DIN-rail earthing foot, and compliance data sheet insert (note: this “X” version omits the optional replaceable fuse/disconnect package for direct pass-through wiring).
2. Product Introduction
Protecting high-integrity process instrumentation loops from destructive transient overvoltages requires deployment inside dense control enclosures where cabinet space is at an absolute premium. Operating as a high-density signal line protector, the ultra-slim 7 mm module bridges the gap between field transmitters and control system I/O cards (—preventing lightning-induced surges and switching transients from damaging sensitive PLC inputs).
Engineered with advanced multistage hybrid circuitry combining gas-filled discharge tubes (GDT) and fast-acting surge diodes, the unit clamps overvoltages while introducing minimal series resistance. Instrumentation reliability engineers rely on this specific non-fused architecture to maintain uninterrupted loop performance across critical 4–20 mA circuits and low-voltage digital signal pathways.
3. Core Technical Specifications
| Parameter | Value |
| Device Type | Signal & I/O Surge Protection Device (SPD) — Non-Fused “X” Version |
| Nominal Working Voltage (Un) | 32 VDC / 22 VAC |
| Rated Load Current (In) | 400 mA |
| Series Resistance | 2.2 \Omega per line |
| Maximum Surge Current | 10 kA (8/20 \mus pulse) |
| Voltage Protection Level (Up) | <45 V at 1 kV/\mus |
| Bandwidth | Up to 25 kHz |
| Mounting Profile | T-section DIN-rail with automatic earthing footprint |
| Country of Origin | United Kingdom (UK) |
4. Global Compliance & Industry Certifications
Regulatory audits penalize facilities that install uncertified surge suppression equipment on safety-instrumented systems.
- Certifications: CE Mark, ATEX Directive compliance for hazardous locations, IECEx, and cULus Listed industrial control protection standards.
- Safety Relevance: The ATEX and hybrid clamping standards ensure that energy diversion cannot create thermal sparks or arcs capable of igniting explosive atmospheres in petrochemical or oil and gas processing environments.
- Audit Note: Verify specific serial lot traceability and hazardous area classification certificates against regional safety compliance mandates prior to final plant commissioning.
5. Long-Term Storage & Asset Preservation Guide
Spare surge protectors stored in warehouse stockrooms are vulnerable to moisture and terminal oxidation over extended periods (—requiring precise environmental controls to protect inventory). Preserve asset integrity by enforcing these procedures:
- Maintain warehouse climate control where ambient storage temperatures remain between -20^\circC and +65^\circC while keeping relative humidity strictly below 80% non-condensing.
- Keep modules sealed inside their original anti-static moisture-barrier packaging with active desiccant packs until the exact panel integration window.
- Inspect the spring-loaded DIN-rail earthing foot and screw clamp terminals annually for dust accumulation or environmental tarnish.
6. Physical Installation Prerequisites
Proper mechanical and electrical layout guarantees that transient energy is safely shunted to the protective earth ground without affecting loop signals.
- Clearance Space: Ensure unobstructed top and bottom access for wire entry, taking advantage of the ultra-slim 7 mm space-saving profile.
- Grounding Requirements: Secure the DIN-rail mounting foot properly to a low-impedance structural copper ground bar; reliable automatic earthing depends entirely on low-resistance rail contact.
- Wiring Verification: Confirm loop polarity and ensure maximum operating voltages do not exceed the 32 VDC threshold to prevent premature GDT firing.
7. Buyer’s FAQ (Logistics & Compliance Focus)
Q: What Harmonized System (HS) Tariff Code applies to the Telematic SD32X for international customs clearance?
A: Electrical surge suppression and overvoltage protection devices typically classify under HS code 8536.30.8000 (Electrical apparatus for protecting electrical circuits for a voltage not exceeding 1,000 V: Other). Always confirm codes with your licensed broker.
Q: What is the primary functional difference between the standard SD32 and the SD32X variant?
A: The “X” version denotes a model without the optional replaceable fuse/disconnect package, serving applications where physical loop-disconnect capability is handled elsewhere.
Q: What is the legal Country of Origin (COO) declaration requirement?
A: Manufactured in the United Kingdom, this product requires proper UK origin marking on commercial export and import documentation to fulfill trade compliance agreements.
Q: Is specialized transit insurance necessary for cargo shipping?
A: Yes, comprehensive freight insurance is recommended to protect against physical housing fractures or internal component damage during international transit.
