Overview
The Mallory SC628JR is an internally driven piezoelectric alarm transducer designed for industrial control panels and equipment monitoring. Operating at 5–20mA across a 6–28VDC supply, the SC628JR delivers 68dB output at 6V with a 2.9kHz resonant frequency. Built for harsh environments, this screw-terminal, panel-mount unit delivers consistent audible alarm signaling for process automation, machinery control, and instrumentation systems.
Key Features
- Internally driven piezo design with slow-pulse tone
- Quick-connect tab terminal (0.250″ / 6.35mm) plus screw terminals
- Wide voltage range: 6–28VDC
- Compact 30mm panel-mount form factor
- CUL/RoHS approved for industrial and OEM applications
- Low power draw; suitable for battery-backed systems
Technical Specifications
- Supply Voltage: 6–28VDC
- Operating Current: 5–20mA (nominal); 6V = 68dB, 28V higher output
- Tone Type: Slow Pulse
- Sound Pressure Level: 68dB @ 6V, 61cm distance
- Resonant Frequency: 2.9kHz
- Mounting: Panel Mount, Screw Neck
- Terminal Type: Quick Connect Tab (0.250″) + Screw
- Material: Piezoelectric element, 6/6 nylon housing
- Certifications: CUL Approved, RoHS Compliant
- Environmental: Industrial grade, rated for control-panel duty
Typical Applications
The SC628JR is deployed across industrial sectors including:
- Wastewater treatment and environmental control systems
- Pharmaceutical and food-processing equipment monitoring
- Refineries, petrochemical facilities, and power plants
- Industrial process automation and machinery alarms
- Security and access control panel indicators
- Control cabinets, PLC-based systems, and DCS annunciators
Compatibility & Replacements
Compatible With
- Industrial control systems (PLC, PLC-5, CompactLogix, etc.)
- DCS and SCADA annunciator outputs
- Any 6–28VDC discrete alarm circuit or relay output
- Standard 24VDC panel power supplies
- Motor control centers (MCC) and starter control schemes
Replaces / Drop-In Replacement For
The SC628JR is part of the Mallory Sonalert SC Series. Related models within the family include SC628 (continuous tone) and SC628R (80–91dBA continuous). Verify your specific tone requirement (slow-pulse vs. continuous) before ordering as replacements.
Works With
- 24VDC industrial control circuits
- Discrete output modules (Digital I/O, relay contacts)
- PLC analog/digital alarm cards
- Field wiring and terminal block connections
- NEMA/IEC control panel wiring practices
