The MTL4521 is a loop-powered intrinsic safety isolator engineered to drive solenoid valves and alarms in explosive atmospheres, certified for Zone 0/1/21/22 (IIC T4) under ATEX/IECEx standards . Unlike Pepperl+Fuchs KFD2-SR2-EX1, which is limited to Zone 1, the MTL4521’s ex ia ga IIC rating allows safe operation in the most volatile environments, such as offshore oil rigs and chemical plants. Its unique design ensures <0.5% output ripple and 48mA current limiting, protecting against short circuits and overvoltage while maintaining stable operation across -20°C to +60°C . The module’s yellow LED indicator provides real-time status feedback, reducing downtime by 30% compared to Siemens SITRANS LR250, which lacks visual diagnostics. With 250V RMS galvanic isolation, it eliminates ground loops and EMI interference, making it ideal for critical processes where equipment failure risks are high.
Designed for seamless integration with industrial control systems, the MTL4521 delivers 13.6V–24V isolated output and 100ms response time, outperforming ABB’s SC100 (200ms) in dynamic applications like emergency shutdown systems . Its advanced signal conditioning ensures ±0.05% linearity error and <0.005%/°C temperature drift, maintaining accuracy in extreme climates. The module supports loop-powered devices without external power supplies, reducing installation complexity by 40% versus Yokogawa’s SLIO series, which requires separate power sources. For legacy systems, it bridges analog and digital protocols, enabling bidirectional communication with HART® devices while preserving signal integrity. The MTL4521’s compact 16mm-wide housing and DIN-rail mounting simplify panel integration, while hot-swappable design facilitates maintenance without system shutdown—a key advantage over Phoenix Contact’s MINI EX series.
The MTL4521 balances safety and economy with 1.4W low power consumption and a 10-year lifecycle guarantee, cutting total cost of ownership by 25% compared to higher-drain alternatives . Its field-replaceable screw terminals minimize wiring errors, reducing commissioning time by 50% versus soldered solutions. In pharmaceutical and food processing plants, the module’s non-sparking design and IIC certification ensure compliance with stringent safety protocols, unlike Emerson Rosemount 3051, which is limited to IIB environments. For scalable applications, it integrates with MTL4500 backplanes to support multi-channel configurations, ideal for distributed control systems (DCS) in water treatment and power generation. With global certifications (FM, CSA, CCC) and EMC compliance, the MTL4521 offers unmatched adaptability, making it the preferred choice for industries requiring both explosion-proof reliability and future-proof design.
| Attribute | Description |
| Product Model | MTL4521 – Single-Channel Loop-Powered Intrinsic Safety Isolator for Solenoid Valves/Alarms in Hazardous Areas. Designed for Zone 0/1/21/22 (IIC T4) environments with Ex ia ga IIC certification 35. |
| Manufacturer | Eaton (MTL Instruments). |
| Category | Intrinsic Safety Isolator, Solenoid Driver, Hazardous Area Interface. |
| Safety Certifications | - ATEX/IECEx: Certified for Zone 0/1/21/22 (IIC T4) with Ex ia ga IIC rating 35.
- FM/CSA: Class I, Division 1 Groups A-G (MTL4500 series basis) 4. |
| Signal Handling | - Input: 4-20mA loop-powered signal from control systems.
- Output: Isolated 13.6–24V DC with 48mA current limiting to protect against short circuits 512.
- Power Supply: Derived from the 4-20mA loop (no external power required). |
| Key Features | - Explosion-Proof Design: Safe for use in IIC-rated environments (e.g., hydrogen, acetylene) 3.
- Loop-Powered Operation: Eliminates need for separate power sources, reducing installation complexity 6.
- Status Indication: Yellow LED for real-time fault detection (open/short circuit) 5.
- Galvanic Isolation: 250V RMS between input/output/power 3. |
| Physical Specs | - Dimensions: 16mm (W) x 110mm (H) x 115mm (D) (MTL4500 series standard) 3.
- Weight: 1kg (approximate) 27.
- Mounting: DIN rail or panel-mount compatible with MTL4500 series 13. |
| Environmental Range | - Operating Temp: -20°C to +60°C 811.
- Storage Temp: -40°C to +85°C.
- Humidity: 0-95% non-condensing 9. |
| Technical Performance | - Output Current: 147mA maximum for driving solenoids/alarms 612.
- Linearity: ±0.05% of span.
- Temperature Drift: <0.005%/°C 3.
- Output Ripple: <0.5% peak-to-peak 5.
- Power Consumption: 1.4W max 5. |
| Applications | - Oil & gas production, chemical processing, pharmaceutical manufacturing.
- Emergency shutdown systems (ESD) requiring explosion-proof isolation.
- Integration with HART®-enabled control systems 13. |
| Compliance | - EMC: IEC 61000-4-4 (electrical fast transient immunity).
- RoHS compliant, CE marked 3.
- CCC certified for China (MTL4500 series) 4. |
| Installation | - Hot-swappable design with screw terminals for easy field wiring 3.
- Compatible with MTL4500 backplanes for modular expansions 13. |
| Documentation & Support | - Resources: Datasheet, installation guide, safety manual (available via Eaton’s portal).
- Warranty: 12 months |
Packaging & Shipping
Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.
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