Overview
The Gems ST-22445 is a SAFE-PAK intrinsically safe relay designed to amplify sensor load-handling capabilities in process control, safety interlocks, and hazardous location applications. The 22445 is a SAFE-PAK 1-pole Intrinsically Safe Relay with SPST-NO contact configuration that amplifies sensor load-handling capabilities in a wide diversity of AC and DC control switching applications. This surplus unit features completely encapsulated construction, impervious to dust, moisture or foreign material, and is tamper-proof and shock and vibration-resistant.
Key Features
- Less than 100 microamps at 9 VDC actuates the unit to control loads to 5A at 120 VAC
- Resistive (up to 100,000Ω) or short-circuiting sensors operate the unit
- SPST-NO (Single Pole Single Throw Normally Open) contact configuration
- No purging or special enclosure requirements for hazardous location deployment
- Modular housings for easier installation
- Solid-state reliability with consistent performance across temperature and vibration
Technical Specifications
Key operational parameters for integration into safety and control systems:
- Coil Voltage: 135VAC (95–135VAC operating range)
- Input Power Frequency: 60Hz
- Load Current (Contact Rating): 5A @ 120VAC
- Contact Configuration: SPST-NO
- Input Sensitivity (Typical): Less than 100 microamps at 9 VDC
- Turn-On Sensitivity: 400K ohm (typical)
- Turn-Off Sensitivity: 1M ohm (typical)
- Voltage Loss: 2VAC
- Terminal Type: Stud terminals
- Mounting: Panel mount / Flange mount
- Series: SAFE-PAK Intrinsically Safe Relay
- Certifications: Intrinsically safe design for hazardous locations
Typical Applications
The Gems ST-22445 is widely deployed in:
- Hazardous location process control and safety interlocks
- Level switch and flow switch amplifier circuits
- Sensor interface applications requiring low-voltage triggering (9–135VAC coil)
- Explosion-proof and intrinsically safe system designs eliminating need for costly enclosures
- Industrial automation and machinery safety systems
Compatibility & Replacements
Compatible With
- Gems Sensors product ecosystem and hazardous location control schemes
- Any 120VAC 60Hz industrial safety or automation circuit requiring SPST-NO relay switching
- AC/DC sensor and switch interface applications
- Low-current sensor circuits (below 100 microamps at 9 VDC)
Replaces / Drop-In Replacement For
- Direct replacement for Gems 22445 (manufacturer part number without hyphen prefix)
- Verify compatibility with your system integrator before ordering for mission-critical applications.
Works With
- Intrinsically safe sensor networks and circuits
- Hazardous location certified control panels and safety systems
- Flow, level, and pressure switch amplifier modules
- Standard 120VAC 60Hz industrial power distribution
