The Littelfuse 235P is designed to protect 5-15 hp, 230 V, single-phase pumps from dry-well, dead-head, jammed impellers, rapid-cycle, and overvoltage and undervoltage conditions. A calibration adjustment allows the 235P to be calibrated to your specific pumping applications, reducing the possibility of false or nuisance tripping. A unique microcontroller-based voltage and current-sensing circuit constantly monitors the incoming power for fluctuations causing overcurrent and undercurrent. When an abnormality such as loss of suction is detected, the 235P deactivates its output relay and directly disconnects the pump motor. The 235P communicates with a hand-held diagnostics tool called the Informer (sold separately). The Informer displays parameters including calibration points, trip points, run time, and last faults. An external current transformer is required for operation (sold separately).
Applications
• Used for single-phase pump protection needs
Specifications
| Functional Specifications | |
| Adjustments/Settings | |
| Overcurrent | 125 % of calibration point |
| Underload (dry-well) | Adjustable (70 to 90 % of calibrated run power |
| Overvoltage | 265 V ac |
| Undervoltage | 190 V ac |
| Number of restarts allowed in a 60-sec. period (rapid-cycling) | 4 |
| Trip Delay Times |
Overcurrent 5 seconds Dry-well 4 seconds |
| Restart Delay Times |
Over/Undervoltage 2 seconds All other faults Manual, 2–225 minutes |
| Input Characteristics | |
| Supply Voltage | 230 V ac |
| Load Range | 5–15 hp (external current transformer required) |
| Frequency | 50/60 Hz (Note: 50 Hz will increase all delay timers by 20 %) |
| Output Characteristics | |
| Output Contact Rating-SPST | A300, 720VA @240 V ac (10 Amps max.) |
| General Characteristics | |
| Operating Temperature | -40 °C to 55 °C (-40 °F to 131 °F) |
| Maximum Input Power | 5 W (max.) |
| Wire Gauge | Solid or Stranded 10–22 AWG |
| Terminal Torque | 13 in.-lbs |
| Dimensions | H 73.66 mm (2.9”) W 133.35 mm (5.25”) D 73.99 mm (2.913”) |
| Weight | 14 oz. |
| Mounting Methods | #8 screws |
| Certification & Compliance | cULus Listed UL 508, C22.2 No. 14 |
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