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 is a compact, DIN-rail mountable relay that continuously monitors three-phase power and disconnects the load when a fault is detected. It is the go-to choice for protecting motors, compressors, and pumps from costly damage caused by phase loss, phase reversal, or voltage imbalance. This guide covers its specifications, selection criteria, and sourcing options for international buyers.
What is an ATC PMR (Phase Monitor Relay) PN: SLD-230-ASA?
An ATC PMR (Phase Monitor Relay) PN: SLD-230-ASA is a protective relay that monitors the voltage of a three-phase supply and trips an internal relay when it detects a fault condition. It is designed to prevent equipment damage by disconnecting the load before a phase loss or reversal can cause motor burnout. The relay is commonly used in HVAC systems, pumps, and industrial machinery where reliable three-phase power is critical.
How does a Phase Monitor Relay work?
A phase monitor relay continuously samples the voltage on all three phases. It compares the phase angles and voltage magnitudes against preset thresholds. When a fault is detected—such as a phase loss, phase reversal, or voltage imbalance exceeding the setpoint—the relay opens its output contacts, cutting power to the protected load. The ATC PMR PN: SLD-230-ASA features an adjustable trip delay to prevent nuisance trips during momentary power disturbances.
Key Specifications of the ATC PMR PN: SLD-230-ASA
| Parameter | Specification |
|---|---|
| Supply Voltage | 230 VAC (50/60 Hz) |
| Monitoring Function | Phase loss, phase reversal, voltage imbalance |
| Output Contacts | 1 SPDT (Form C) relay, 5 A @ 250 VAC |
| Mounting | DIN rail (35 mm) |
| Operating Temperature | -20°C to +60°C |
| Response Time | Adjustable, 0.1 to 10 seconds |
Types and Applications of Phase Monitor Relays
Phase monitor relays come in several configurations. The ATC PMR PN: SLD-230-ASA is a fixed-voltage unit, meaning it is calibrated for a specific supply voltage (230 VAC). Other types include adjustable-voltage relays and units with additional features like under/over-voltage monitoring. Common applications include:
- HVAC compressors and condensing units
- Water pumps and irrigation systems
- Conveyor systems and material handling equipment
- Machine tools and CNC equipment
- Refrigeration systems
Selection Criteria: How to Choose the Right Phase Monitor Relay
- Verify your supply voltage: The ATC PMR PN: SLD-230-ASA is designed for 230 VAC three-phase systems. Confirm your line voltage matches this rating.
- Check frequency compatibility: This unit operates on both 50 Hz and 60 Hz supplies, making it suitable for international use.
- Determine the load type: For inductive loads like motors, ensure the relay's contact rating (5 A @ 250 VAC) is sufficient for your application.
- Consider environmental conditions: The relay operates in temperatures from -20°C to +60°C. For outdoor or harsh environments, consider a higher-rated enclosure.
- Evaluate trip delay requirements: Adjustable trip delay (0.1 to 10 seconds) helps prevent nuisance trips during brief power fluctuations.
Product Comparison: ATC PMR vs. Related Monitoring Solutions
| Product | Type | Key Feature | Best For |
|---|---|---|---|
| WESTWARD 13.5-inch Reversible Ratchet | Hand Tool | 5° arc swing, chrome finish | Mechanical maintenance |
| WESTWARD 17.25-inch Reversible Ratchet | Hand Tool | Extended reach, 5° arc swing | Confined space work |
| SCS Monitor Verification Tester | ESD Accessory | NIST-traceable verification | ESD control programs |
| LUXOR 15.6-inch Portable Monitor | Display | USB-C, magnetic mount | Portable workstation |
While the ATC PMR PN: SLD-230-ASA is a specialized control component, the products above represent the breadth of 3G Electric's inventory. For phase monitoring, the ATC PMR is the correct choice. For general maintenance tasks around your electrical panels, the WESTWARD ratchets are practical additions to any toolkit.
Why Source from 3G Electric?
3G Electric is a global industrial solutions provider with over 35 years of experience. We stock 4+ products in the controls category and offer far more across 14 industrial departments. Our specialist depth in combustion, pumps, and controls means we can help you select the right phase monitor relay for your application. We provide technical support, export documentation, and worldwide delivery with incoterms-neutral supply options.
According to the ATC SLD-230-ASA Datasheet, 2024: "The SLD-230-ASA is designed to protect three-phase motors from phase loss, phase reversal, and voltage imbalance, ensuring reliable operation in industrial environments."
Frequently Asked Questions
How do I select the right ATC PMR for my application?
First, verify your supply voltage and frequency. The SLD-230-ASA is rated for 230 VAC at 50/60 Hz. Next, consider your load type and contact rating requirements. For motors over 5 A, you may need an external contactor. Finally, check the ambient temperature range to ensure the relay's -20°C to +60°C rating is suitable.
Where can I buy the ATC PMR PN: SLD-230-ASA in Worldwide?
3G Electric supplies the ATC PMR PN: SLD-230-ASA worldwide. We offer export documentation, competitive pricing in USD, and reliable shipping to international destinations. Contact our technical sales team for a quote and lead time estimate for your region.
What is the difference between a phase monitor relay and a phase sequence relay?
A phase monitor relay detects phase loss, phase reversal, and voltage imbalance. A phase sequence relay specifically checks the order of phases (L1-L2-L3) and prevents operation if the sequence is incorrect. The ATC PMR PN: SLD-230-ASA combines both functions in a single unit.
Can the ATC PMR PN: SLD-230-ASA be used on a 60 Hz supply?
Yes, the SLD-230-ASA is rated for both 50 Hz and 60 Hz operation. This makes it suitable for use in North America (60 Hz) and Europe/Asia (50 Hz) without modification.
What is the typical lead time for international orders?
Lead times vary by destination. For stock items like the ATC PMR PN: SLD-230-ASA, we typically ship within 24-48 hours. International delivery takes 3-7 business days depending on the shipping method and customs clearance. Contact us for a precise estimate for your location.
Key Takeaways
- The ATC PMR PN: SLD-230-ASA is a 230 VAC three-phase monitor protecting against phase loss, reversal, and imbalance.
- It operates on both 50 Hz and 60 Hz supplies, making it ideal for international use.
- Selection requires verifying voltage, load type, and environmental conditions.
- 3G Electric offers genuine ATC components with worldwide shipping and technical support.
Contact 3G Electric today for quotes, sizing assistance, and technical support on the ATC PMR PN: SLD-230-ASA and all your industrial control needs.
