Protect Pumps, Motors, Panels & Control Circuits With the Right Macromatic Relay

Alternating Relays

Macromatic alternating relays rotate operation between 2 or 3 loads so pumps, compressors, and motors share runtime instead of wearing unevenly.

• Door mount or plug-in models available
• Useful for duplex pump, wastewater, or HVAC systems
• SPDT, SPNO, DPDT, and DPDT cross-wired outputs

Current Sensing Relays

Macromatic current sensing relays monitor AC single-phase current to help detect over-current or under-current conditions.

• Over-current, under-current, or dual monitoring options (using a selector switch)
• Encapsulated housings for harsh conditions
• Startup and trip time delay features
• Integrated transformer
• Commonly used on pumps, conveyors, packaging machines, and HVAC equipment

Phase Monitor Relays

Macromatic phase monitor relays protect 3-phase equipment from phase loss, phase reversal, phase unbalance, undervoltage, and overvoltage.

• Plug-in and DIN rail models available
• Some models monitor all 5 major phase faults
• SPDT, DPDT, or SPNO outputs
• Used for motors, pumps, generators, elevators, and material handling systems

Voltage Monitor Relays

Macromatic voltage monitor relays watch AC single-phase or DC voltage so equipment can alarm or shut down before unstable voltage causes control problems.

• Overvoltage and undervoltage monitoring options
• Plug-in or DIN-Rail mount models
• SPDT or DPDT output
• Voltage band models keep circuits within set limits
• Fixed or adjustable time delay options
• Ideal for wastewater, car washes, material handling & packaging, HVAC, and irrigation

Time Delay Relays

Macromatic time delay relays add controlled timing to industrial panels for start delays, stop delays, sequencing, anti-short-cycle protection, and timed machine functions.

• Plug-in, encapsulated, modular, and 1/16 DIN styles
• Programmable, single-function, and multi-function options
• Digital and analog timing adjustment available
• View the different timing functions here
• Made for material handling & packaging, pump control, HVAC, and generators

Seal Leak & Temperature Relays

Macromatic seal leak and temperature relays monitor submersible pumps for moisture intrusion and over-temperature conditions before failures become expensive repairs.

• Plug-in and door mount models available
• LEDs indicate leak or over-temperature errors
• SPDT, DPDT, or SPNO output
• Designed for wastewater and pump control panels

Intrinsically Safe Relays

Macromatic intrinsically safe relays let control circuits interface with hazardous locations while keeping the controlled load in a safer area of the system.

• Plug-in and DIN rail mount options
• SPNO or SPST-NO output options
• Useful for wastewater, pump control, and hazardous-location signaling

General Purpose Relays

Macromatic general purpose relays are used for basic load switching, signal isolation, output expansion, and control circuit replacement in industrial panels.

• Practical for OEM panels and maintenance stock
• Common contact ratings include 6A, 10A, and 12A
• DIN-Rail and plug-in models available
• Good fit when specialized monitoring or timing is not required

Liquid Level Control Relays

Macromatic liquid level control relays monitor conductive liquids through probes to automate pump-up or pump-down operation in tanks, wells, sumps, and reservoirs.

• Pump-up and pump-down models available
• Sensitivity options for different liquid conductivity levels
• Time delay options help reduce chatter from turbulence

Percentage Timers

Macromatic percentage timers control repeat-cycle equipment when the total cycle stays fixed but the ON time needs to adjust as a percentage of that cycle.

• Used for dosing, lubrication, heaters, blowers, and pulsed outputs
• 120V AC and 240V AC models available
• Cycle ranges include 15 seconds through 1 hour
• Models with memory remember the timing sequence in the event of a power failure

🔁 Alternating Relay Logic

This spreads runtime across equipment and helps reduce uneven wear on the lead pump or compressor.

📊 Percentage Timer Example

Use this setup when the process output needs to repeat at a controlled duty cycle instead of staying fully energized.

Do Macromatic plug-in relays include the socket?

Many Macromatic plug-in relays use 8-pin or 11-pin octal sockets, and sockets are often sold separately. Check the product page before ordering so the relay and socket match.

What is the difference between a phase monitor relay and a voltage monitor relay?

A phase monitor relay is used on 3-phase systems to detect issues such as phase loss, reversal, imbalance, overvoltage, or undervoltage. A voltage monitor relay checks AC single-phase or DC voltage against acceptable limits.

When should I use an alternating relay?

Use an alternating relay when two or three loads should share runtime. This is common in duplex pump systems where lead and lag pumps need to rotate automatically.

When should I use a percentage timer instead of a time delay relay?

Use a percentage timer when the process repeats on a fixed cycle and the ON time must be adjustable as a percent of that cycle. Use a time delay relay when you need a delay-on, delay-off, interval, one-shot, or sequencing function.