Over/Under Motor Load Monitor
The Model 421 Over/Under Motor Load Monitor offers essential protection for industrial motor applications. This device continuously monitors motor current, detecting both overload and underload conditions to prevent equipment damage and operational downtime. Its adjustable trip delay, ranging from 0.3 to 180 seconds, allows for precise response tailoring to specific motor characteristics and load fluctuations. A configurable restart delay, up to 4 hours, aids in system recovery and prevents immediate re-engagement after a fault. The monitor provides a 4-20mA current output, enabling integration with chart recorders and control systems for data logging and remote monitoring. With an operating temperature range of -20° to 131° F and transient protection up to 2500V, the Model 421 ensures reliable performance in diverse industrial environments. Its robust design supports both single-phase and three-phase motor systems, contributing to enhanced operational longevity and efficiency.
Motor Load Monitor Csa
Specifications
| Input Voltage Range | 100-130VAC or 200-250VAC |
|---|---|
| Frequency | 50/60Hz |
| Power Consumption | 0.5 VA |
| Nominal Current | 2.5 amps |
| Minimum Current | 0.25 amps |
| Current Adjustment | 0-5 amps x PF |
| Current Output | 4-20mA for chart recorders |
| Repeat Accuracy | 1% (fixed conditions) |
| Output | SPDT 10A at 240VAC resistive |
| Expected Relay Life (Mechanical) | 10 million operations |
| Expected Relay Life (Electrical) | 100,000 operations at rated load |
| Trip Delay | OFF or 0.3 to 180 seconds |
| Restart Delay | OFF or 0.1 to 4 hours |
| Indicator (Overload/Underload) | Red LED: Overload or Underload; tripped |
| Indicator (Restart Timing) | Yellow LED: Restart timing |
| Transient Protection | 2500V for 10ms |
| Operating Temperature | -20° to 131° F |
| Humidity Tolerance | 97% w/o condensation |
| Enclosure Material | ABS plastic |
| Agency Approvals | UL Listed to US and Canadian safety standards CSA Certified |
| Phase Compatibility | Single-phase or 3-phase |
| 4-20mA Output Scaling | 4mA output is equal to 0 watts and a 20mA output is equal to 600 watts at 120 V or 1200 watts at 240 V |
| Config: DIP SW 1 (Overload Restart) | ON=Disabled, OFF=Enabled |
| Config: DIP SW 2 (Restart Delay) | ON=Enabled, OFF=Disabled |
| Config: DIP SW 3 (Reset Button) | ON=Enabled, OFF=Disabled |
| Config: DIP SW 4 (Trip Delay) | ON=Enabled, OFF=Disabled |
| Warranty | This product is warranted to be free from defects in materials and workmanship for one year. |