The Macromatic SFF240A250 is a seal leak relay. This 8 Pin plug-in relay has an input voltage of 240V. It is a deadfront, inner door mounted, single channel relay made to monitor for leaks in submersible pump seals and has an output of 10A SPDT. The sensitivity is adjustable and LEDs on the top show the current status. The single channel feature means that the relay detects leaks for a single pump. Includes 8 pin OR08-PC back mounted socket. Note: Image is for reference, actual part may differ.

Specifications

• Relay Function- Seal Leak, Single Channel
• Input Voltage- 240V AC
• Output- 10A SPDT
• Sensitivity Range- 1K to 250KOhm
• Voltage Tolerance- +10/-15% of nominal @ 50/60 Hz
• Load- 3VA
• Probe Voltage- 5V DC Pulsed
• Operating Temperature- -28 C to 65 C (-18 F to 149 F)
• Storage Temperature- -40 C to 85 C (-40 F to 185 F)
• Output Contacts- 10A @ 240V AC / 7A @ 28V DC, 1/4 HP @ 120V AC (N.O.)
• Life- Mechanical: 10,000,000 Operations, Full Load: 100,000 Operations
• Response Time- Pick up: 1 sec, Drop out: 1 sec
• Dimensions- 4.2" Height x 2.1" Width x 2.9" Depth
• Approvals- UL and CUL Recognized, CE, UL & CUL Listed (with Socket)

The resistance is measured by a probe that is inserted in the pump seal cavity. In the event of a leak, resistance between the probe and the connection is lowered by contaminating fluid that goes into the seal cavity. The relay energizes when the resistance goes below the preset sensitivity point and the LED is red. Otherwise, the LED is green as long as the input voltage is present.

Macromatic SFF Series Relay Installation Instructions

Macromatic Single Channel 240V 1K to 250K Pump Seal Failure Relay