ATC PMR (Phase Monitor Relay) PN: SLD-230-ASA | Buyer's Guide
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The ATC PMR (Phase Monitor Relay) PN: SLD-230-ASA (P/N SLD-230-ASA) is a dedicated three-phase monitoring relay designed to protect motors and driven equipment from supply faults. It continuously measures the incoming three-phase voltage and trips its output relay when it detects phase loss, phase sequence reversal, or voltage imbalance beyond a set threshold. This relay is a standard choice for OEM panels, pump controls, and HVAC systems where an unscheduled shutdown is preferable to a burnt-out motor.
What is a Phase Monitor Relay?
A phase monitor relay is a protective device that supervises the quality of a three-phase power supply. It is wired into the control circuit of a motor starter or contactor and will interrupt the control signal if the supply becomes unsafe. The ATC PMR (Phase Monitor Relay) PN: SLD-230-ASA (P/N SLD-230-ASA) is a specific model in this category, rated for 230 VAC systems.
According to the ATC Diversified Electronics PMR Series datasheet, 2023: "The PMR series monitors three-phase power lines for phase loss, phase reversal, and low voltage, providing a relay output for motor control."
How Does the ATC SLD-230-ASA Work?
The relay compares the three phase voltages against an internal reference. If any phase drops below the under-voltage set point, or if the phase rotation is incorrect, the internal relay de-energizes. This action opens the control circuit, stopping the motor before damage occurs. The SLD-230-ASA is designed for continuous duty and provides a fail-safe operation: if the relay loses its own supply, the output drops out.
Key Specifications of the SLD-230-ASA
| Parameter | Specification |
|---|---|
| Nominal Supply Voltage | 230 VAC (50/60 Hz) |
| Monitoring Function | Phase loss, phase reversal, under-voltage |
| Output Type | Relay (SPDT) |
| Mounting | DIN rail or panel mount |
| Operating Frequency | 50 Hz / 60 Hz |
Types and Applications
Phase monitor relays are categorized by their voltage range and monitoring features. The SLD-230-ASA is a fixed-voltage model, ideal for dedicated 230 VAC systems. Other types include adjustable-range relays and models with built-in time delays. Common applications include:
- Protecting irrigation pump motors from single-phasing.
- Monitoring conveyor systems in material handling.
- Supervising HVAC compressor units.
- Ensuring correct phase rotation on newly installed machinery.
How to Select the Right Phase Monitor Relay
- Verify the system voltage: Confirm your supply is 230 VAC (50/60 Hz) to match the SLD-230-ASA. Using a relay with the wrong voltage rating will cause immediate failure.
- Determine the load type: For motor loads, ensure the relay's output contacts are rated for the contactor coil current.
- Check the frequency: The SLD-230-ASA operates on both 50 Hz and 60 Hz, making it suitable for international use.
- Consider the environment: For dusty or wet locations, verify the relay's ingress protection rating.
- Decide on adjustability: If your supply voltage fluctuates, consider an adjustable model instead of a fixed one.
Product Comparison: Related Industrial Components
| Product | Type | Key Feature | Application |
|---|---|---|---|
| WESTWARD 13.5-inch Reversible Ratchet | Hand Tool | 13.5 in (343 mm) length, 5° arc swing | Maintenance in confined spaces |
| WESTWARD 17.25-inch Reversible Ratchet | Hand Tool | 17.25 in (438 mm) length, 5° arc swing | Heavy-duty assembly tasks |
| SCS Monitor Verification Tester | ESD Accessory | NIST-traceable verification | ESD control program audits |
| LUXOR 15.6-inch Portable Monitor | Display | USB-C connection, magnetic mount | Portable workstation setup |
While the ATC SLD-230-ASA is a control component, the tools and accessories above support the installation and maintenance of such systems. The WESTWARD ratchets are ideal for tightening panel hardware, while the SCS tester ensures your ESD program remains compliant.
Why Source from 3G Electric?
3G Electric is a global industrial solutions provider with over 35 years of experience. We stock the ATC PMR (Phase Monitor Relay) PN: SLD-230-ASA (P/N SLD-230-ASA) and support it with technical expertise. Our team can assist with cross-market voltage and frequency variants, and we provide export documentation for worldwide delivery. We supply across 14 industrial departments, ensuring you get the right part, not just a part.
Frequently Asked Questions
What is the ATC PMR (Phase Monitor Relay) PN: SLD-230-ASA used for?
It is used to protect three-phase motors from damage caused by phase loss, phase reversal, or voltage imbalance. It monitors the supply and trips a relay to stop the motor if a fault is detected.
Can I use the SLD-230-ASA on a 400 VAC system?
No. The SLD-230-ASA is specifically rated for 230 VAC. For 400 VAC systems, you would need a different model, such as the SLD-400 series. Always match the relay voltage to your supply.
How do I buy the ATC SLD-230-ASA in Worldwide?
Contact 3G Electric for a quote. We supply worldwide with export documentation and can advise on the correct model for your local grid frequency (50 Hz or 60 Hz).
What is the difference between a phase monitor relay and a phase sequence relay?
A phase monitor relay checks for loss, reversal, and imbalance. A phase sequence relay only checks the rotation direction. The SLD-230-ASA combines both functions in one unit.
Key Takeaways
- The ATC SLD-230-ASA is a 230 VAC phase monitor relay protecting against phase loss, reversal, and under-voltage.
- It operates on both 50 Hz and 60 Hz supplies, making it a global solution.
- Always verify your system voltage before purchasing to avoid misapplication.
- 3G Electric offers technical support and worldwide shipping for this control component.
Contact 3G Electric today for a quote on the ATC PMR (Phase Monitor Relay) PN: SLD-230-ASA (P/N SLD-230-ASA) or for assistance selecting the right phase monitoring solution for your application.
