Phoenix REL Series Relay Selection Guide: Precise Matching of Part Number, Model, and Application

Opening: Reliable Industrial Relay Solutions – One-Stop Part Number & Model Reference

In industrial automation control systems, relays serve as core components for signal conversion, circuit switching, and safety interlocking. The Phoenix REL series offers a comprehensive product lineup tailored to diverse industrial needs, featuring stable switching performance, multiple voltage adaptations, flexible contact configurations, and specialized functional designs (e.g., surge protection, LED indication). From standard control scenarios to harsh industrial environments, the REL series delivers consistent reliability. This guide integrates part number-model correspondence, core technical parameters, and scenario-specific recommendations to simplify technical selection and procurement, helping you quickly lock in the optimal relay solution for your control system.

I. Core Advantages: Why Choose the Phoenix REL Series?

• Wide voltage compatibility: Supports AC/DC control voltages (12V-230V), adapting to global industrial power systems (e.g., 24DC for automation, 230AC for mains power).
• Flexible contact configurations: Covers single-pole (1X1), double-pole (2X21), triple-pole (3X21), and mixed contact types (3X1AU/1X2AU), meeting switching needs for different circuits.
• Specialized functional designs: Integrates surge protection (LDP), LED indication (BL/L), ground terminals (FG), and modular installation (MB), enhancing system safety and maintainability.
• Industrial-grade durability: Operating temperature range of -25°C to +60°C, anti-vibration and anti-electromagnetic interference (EMI) capabilities, suitable for harsh factory floors.
• Easy integration: DIN rail mounting, compact design, and compatibility with Phoenix’s Inline product ecosystem, simplifying control cabinet layout and wiring.

II. Complete Product Series Selection Table (Part Number + Model + Core Information)

1. REL-SR Series: Standard Relays with Special Contact Configurations

Designed for general-purpose control with mixed contact types or ground functions, ideal for multi-circuit switching scenarios.

2. REL-SG Series: Compact General-Purpose Relays

Cost-effective compact relays with standard contact configurations, suitable for basic switching needs in space-constrained environments.

3. REL-PR Series: Precision Relays with Modular Design

High-precision relays with modular installation and stable switching performance, suitable for critical control systems.

4. REL-OR Series: Relays with Special Functions (LED Indication/Surge Protection)

Integrates LED status indication or surge protection (LDP) for enhanced system visibility and reliability, suitable for harsh or safety-critical environments.

III. 3-Step Quick Selection Technique (Easy for Beginners)

Step 1: Determine the Relay Series Based on Functional Needs

• Standard mixed contact/ground function: REL-SR series (e.g., multi-circuit switching with ground protection → 1157954).
• Compact basic switching: REL-SG series (e.g., small control cabinets → 2960067).
• Precision modular installation: REL-PR series (e.g., Inline system integration → 2908040).
• LED indication/surge protection: REL-OR series (e.g., status monitoring → 2906307; harsh environments → 2903693).

Step 2: Confirm Control Voltage & Contact Configuration

• Control Voltage:
  • Automation systems: 24DC (most models, e.g., 2903702, 2906307).
  • Mains power: 230AC (e.g., 2903705, 2906308) or 120/115AC (North America → 2903695, 1109568).
  • High-voltage DC: 110DC/125DC/220DC (e.g., 2908044, 2909207).
• Contact Configuration:
  • Single-circuit switching: 1X1 contacts (e.g., 2908040).
  • Dual-circuit switching: 2X21 contacts (e.g., 2961574, 2834232).
  • Triple-circuit switching: 3X21/3X1 contacts (e.g., 2903702, 2903706).
  • Mixed contacts: 3X1AU+1X2AU (e.g., 1157954) for multi-type circuit needs.

Step 3: Select Special Functions

• Visual status check: LED indication (OR-BL/L series → 2906307).
• Surge protection: LDP suffix (e.g., 2903693) for inductive loads (motors, solenoids).
• Modular integration: MB mounting (PR1 series → 2908040) for Inline cabinets.
• Ground protection: FG suffix (SR series → 2908777) for safety interlocks.

IV. Recommended Industry-Scenario Combinations (Ready-to-Use)

V. Selection Pitfall Avoidance Guide (Common Mistakes to Note)

1. Voltage mismatch: Control voltage must match the system power supply (e.g., 24DC relays cannot be used with 230AC), otherwise the relay will burn out or fail to switch.
2. Insufficient contact capacity: Confirm the relay’s contact current rating (standard: 10A/250VAC) matches the load (e.g., high-power motors may require contactors in series).
3. Ignoring surge protection: Inductive loads (motors, solenoids) must use LDP-suffix models (2903693) to suppress voltage spikes and extend relay life.
4. Contact type error: Normally open (1X1) vs. normally closed (B) contacts must match the circuit logic (e.g., emergency stop circuits use normally closed contacts).
5. Space constraint neglect: Compact cabinets should select REL-SG series (2960067) instead of larger PR/OR series to save space.
6. Regional voltage incompatibility: North American systems (120AC/115AC) must use corresponding voltage models (2903695, 1109568) instead of 230AC models.

Conclusion: Select the Right REL Relay for Reliable Control

The Phoenix REL series provides versatile, reliable solutions for industrial control systems with its wide voltage compatibility, flexible contact configurations, and specialized functional designs.