$ 84.18
Compact 24V AC/DC relay module with dual changeover contacts, safe isolation, and durable design for reliable industrial control and automation systems.
The Phoenix Contact EMG 17-REL/KSR-24/21-21-LC AU Relay Module is a versatile interface component engineered for dependable signal switching in automation and control systems. Operating at 24 V AC/DC, it features two changeover contacts and provides safe isolation between coil and contact sides, ensuring system protection and electrical safety. With an integrated input and suppression circuit, it maintains consistent performance under varying load conditions. Compact at just 17.5 mm width, this relay module supports DIN rail installation, making it ideal for modern control cabinets that demand space efficiency and high reliability.
Designed for precision and endurance, the EMG 17-REL/KSR-24/21-21-LC AU bridges low-voltage control signals to higher load circuits with exceptional reliability. Its AgNi contacts with gold plating guarantee long-term performance even in demanding switching operations, while the reinforced insulation up to 6 kV ensures user and equipment safety. A yellow LED indicator provides immediate operational feedback, reducing troubleshooting time. Thanks to its low power consumption and high mechanical life cycle, this relay module minimizes maintenance needs and enhances overall system efficiency, making it a strong choice for industrial automation, HVAC controls, and machine interfaces.
Because it delivers precision control and electrical safety in one compact design. With dual changeover contacts, reinforced insulation, and integrated suppression circuitry, this relay module ensures seamless signal transfer and system protection — a dependable choice for engineers who demand stability, longevity, and efficient control performance in industrial automation.
The EMG 17-REL/KSR-24/21-21-LC AU eliminates unreliable switching and electrical interference in control systems. It bridges low-voltage logic with high-voltage loads safely, preventing damage to sensitive electronics. By offering noise-free operation, fast response times, and secure isolation, it solves the challenge of maintaining precise control in high-demand industrial environments.
| Feature | Details | Benefit |
|---|---|---|
| Nominal Input Voltage | 24 V AC/DC | Compatible with common control system voltages. |
| Input Voltage Range | 19.2 V to 26.4 V AC/DC | Provides stable operation under voltage fluctuations. |
| Contact Type | 2 changeover contacts (SPDT) | Enables flexible switching for multiple signal paths. |
| Contact Material | AgNi with hard gold plating | Long contact life and reliable signal transmission. |
| Maximum Switching Voltage | 250 V AC/DC | Supports control of both AC and DC loads. |
| Continuous Current Rating | Up to 5 A | Handles medium load devices with ease. |
| Insulation Type | Safe isolation, reinforced (6 kV) | Ensures user and equipment protection from electrical surges. |
| Protective Circuit | Integrated bridge rectifier and suppression | Prevents interference and extends relay life. |
| Response Time | 8 ms (typical) | Delivers fast and accurate switching performance. |
| Release Time | 10 ms (typical) | Supports rapid control system response. |
| Operating Indicator | Yellow LED | Provides clear visual status of relay activation. |
| Mounting Type | DIN rail mounting | Simplifies installation and maintenance. |
| Dimensions (W x H x D) | 17.5 × 75 × 62.5 mm | Compact footprint ideal for control panel integration. |
| Ambient Operating Temperature | -20 °C to +40 °C | Reliable performance in varied environmental conditions. |
| Mechanical Service Life | Approx. 20 million cycles | Ensures long-term durability and reduced downtime. |
| Connection Method | Screw connection (M3, 0.2–4 mm²) | Secure and convenient wiring for flexible use. |
| Color | Green (RAL 6021) | Matches Phoenix Contact’s standard industrial color scheme. |
| Certifications | UL Recognized, cUL, EAC | Meets international safety and performance standards. |
Download EMG 17-REL/KSR-24/21-21-LC AU (2941439) Datasheet
| Commercial Data | Details |
|---|---|
| Part Number | 2941439 |
| GTIN Number | 4017918080433 |
| Customs Tariff Number | 85364190 |
| Weight (per piece) | 56.96 g |
| Country of Origin | Germany (DE) |
In automated conveyor systems, this relay module works as a reliable interface between the PLC and motor control circuits. Its dual changeover contacts allow smooth switching between forward and reverse motor directions without additional relays. The reinforced insulation protects sensitive PLC outputs from electrical noise generated by motors. Thanks to the built-in suppression circuit, operators experience fewer false triggers, ensuring continuous, safe operation in production lines where precision control is critical.
Within heating, ventilation, and air conditioning systems, the module manages compressors, dampers, and fans responding to thermostat signals. Operating on 24 V AC/DC, it integrates easily with building automation standards. The compact housing fits multiple relays in a small panel space, while the LED indicator offers quick visual feedback for maintenance staff. Its long service life and high switching reliability ensure consistent climate control with minimal system downtime over years of operation.
In industrial machinery, this relay module strengthens safety circuits by isolating low-voltage logic from high-power actuators. The safe isolation up to 6 kV prevents voltage leaks that could endanger operators or damage control units. The redundant dual contacts enhance safety by providing two independent disconnection paths. Its interference suppression design ensures accurate signal transmission even in high-EMI environments, making it a dependable choice for emergency-stop and safety interlock systems.
In process industries such as water treatment or chemical plants, the relay module separates control signals from heavy-load equipment. The AgNi gold-plated contacts maintain low resistance and stable signal quality, even under continuous operation. The integrated input circuit protects against voltage surges, while the compact DIN-rail mount simplifies installation within dense control panels. This results in reliable signal transmission, reduced maintenance, and enhanced safety for both operators and electronic controllers.
| Category | Product Name / Accessory | Part Number | Purpose / Compatibility |
|---|---|---|---|
| Related Product | EMG 17-REL/KSR-24/21-21 | 2961105 | Suitable for general automation tasks where gold plating is not essential. |
| EMG 17-REL/KSR-230/21-21-LC AU | 2961118 | Ideal for high-voltage systems while maintaining identical module dimensions. | |
| EMG 17-REL/KSR-12/21-21-LC AU | 2961121 | Perfect for low-voltage control systems requiring identical relay performance. | |
| EMG 17-REL/KSR-60/21-21-LC AU | 2961125 | Used in industrial systems powered by custom or battery voltage levels. | |
| Accessory | EMG-GKS 12 Marking Material | 2947035 | Attaches directly to the EMG module for circuit identification and maintenance labeling. |
| PLC-INSP 24 V Fuse Terminal Block | 2905663 | Prevents overloads and short circuits in the relay’s coil circuit. | |
| UMK SE 17.5 End Clamp | 3002857 | Holds EMG modules firmly in place inside control panels. | |
| RIFLINE Relay Base Adapter | 2900950 | Enables easy integration, replacement, or expansion of EMG series relays. |
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Warranty – 1-year warranty for your peace of mind.
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