Secutron MRI-4021 Multi-Sensor Detector without Isolation

Deliver dependable, early detection across commercial and institutional sites with the Secutron MRI-4021 multi-sensor combination detector. Combining photoelectric smoke sensing with two heat detection options, this Secutron Combination Detector gives security and facilities teams faster, more accurate alerts while minimizing costly false alarms—protecting people, assets and business continuity. Certified to UL 268 7th edition and CAN/ULC S529 Rev 4, the MRI-4021 meets strict code requirements for fire detection and integrates cleanly into existing surveillance and monitoring infrastructures. Its fully digital SLC protocol supports up to 240 MRI-4000 devices on a single loop for scalable central monitoring, and dual 360° LEDs provide clear visual status for first responders and maintenance staff. Installers benefit from easy addressing via the MIX-4090 handheld programmer and broad compatibility with MRI-4000 bases and modules. Ideal for data centers, retail, healthcare and multi-tenant buildings where reliable security, fire monitoring and reduced nuisance alarms matter, the MRI-4021 streamlines installation and ongoing operations. Contact your Secutron distributor to specify the MRI-4021 for your next fire protection project.

• Provides fast, reliable early fire detection with combined photoelectric and heat sensing to minimize property damage and business downtime
• Advanced false-alarm rejection using intelligent algorithms, reducing nuisance alarms and lowering maintenance costs
• Built to meet UL 268 7th edition and CAN/ULC S529 Rev 4 for code-compliant fire protection and easy approval in regulated installations
• Scalable digital SLC communication supports up to 240 MRI-4000 devices for centralized monitoring and seamless security system integration
• Flexible detection with two heat settings (fixed 135°F or 135°F with Rate-of-Rise) and selectable sensitivity through the FACU for site-specific protection
• 360° dual-color LED indicators and compatibility with MRI-4000 bases simplify installation, status visibility, and serviceability