The Simpson Electric 3323 is a DC meter relay with dual set point control for industrial process monitoring and circuit actuation. Its annular, self-shielding movement and pivot-jewel suspension deliver ±2% DC accuracy and ±3% AC accuracy across full scale. The unit switches within 1% of indication with maximum 1.5-second response time and maintains repeatability within 0.5% F.S. Independent upper and lower set points adjust across 0-100% and 0-95% arc ranges respectively, with 4° minimum differential. On/off hysteresis is held to ±0.5% F.S. The relay accommodates both auto-reset and manual-reset modes, selectable per set point, with failsafe output contacts that open upon power loss.
Technical Specifications
• Model: 3323AIXA (3.5-inch)
• Type: DC Meter Relay, 3300 Series
• Movement: Annular, self-shielding with pivot and jewel suspension
• Accuracy: ±2% F.S. (DC), ±3% F.S. (AC)
• Tracking: ±3%
• Repeatability: Within 0.5% F.S.
• Response Time: 1.5 seconds maximum
• Switching Precision: Within 1% of indication
• Differential: ±0.5% F.S. (On/Off)
• Overload Capacity: 10× F.S. (1 second, DC); 1.5× F.S. (continuous, DC); 7 A (AC, both durations)
– Key Features
• Dual independent set points with 0-100% and 0-95% arc adjustment ranges
• Minimum 4° separation between set points
• Selectable auto-reset or manual-reset per control channel
• DPDT output relay contacts rated 5 A @ 120 VAC resistive
• Failsafe relay output on power loss
• Rugged sealed metal case: moisture, dust, and dirt proof
• Magnetically isolated rear case eliminates calibration drift from steel panel mounting
• Input power: 108-132 VAC, 50-400 Hz (215-245 VAC available on request)
• Nominal power draw: 5 VA
• Contact voltage drop: 50 mV
• Maximum circuit-to-ground voltage: 250 V rms
– Typical Applications
Process control, alarm thresholding, dual-limit monitoring in harsh industrial environments requiring sealed, magnetically-shielded measurement and switching.
– Compatibility & Integration
Output contacts support 5 A @ 120/240 VAC resistive loads. Auto-reset configured via jumper terminals; manual-reset via normally-open SPST switch. Master reset (DPDT, no electrical inter-pole connection) available for simultaneous dual set point reset.
