Siemens Plug-in Relay 24VAC 8A 2CO 15.5mm LZX:RT424524

Industrial control panels and building automation systems often need a compact, reliable relay that can switch moderate loads directly from a PLC output. The Siemens LZX:RT424524 plug-in relay is built for exactly that: a 24 V AC coil, two changeover contacts rated 8 A, and a slim 15.5 mm housing that fits standard relay sockets. Maintenance technicians and panel builders use it to replace worn relays or expand control circuits without redesigning the DIN rail layout.

Key specifications

• Coil voltage: 24 V AC
• Contact configuration: 2 changeover contacts (DPDT)
• Maximum switching current: 8 A
• Maximum switching voltage: 250 V AC / 24 V DC
• Contact material: Silver Nickel (AgNi)
• Electrical endurance: 100,000 cycles at rated load
• Mechanical endurance: 30,000,000 cycles
• Operating temperature range: -40 to +70 °C
• Mounting type: Plug-in (for relay socket)
• Protection class: IP40
• Coil power consumption: 0.9 VA
• Insulation voltage: 250 V
• Dielectric strength coil/contact: 2500 V AC
• Dielectric strength open contacts: 1000 V AC
• Number of poles: 2
• Product series: SIRIUS 3TG10

Why choose it

The AgNi contacts handle both resistive and slightly inductive loads up to 8 A, and the 0.9 VA coil keeps heat low inside densely packed panels. With 30 million mechanical operations, it outlasts typical electromechanical relays in high-cycle applications. The 15.5 mm width saves space on the DIN rail, leaving room for additional modules.

Ideal use cases

• Interposing relay between PLC outputs and contactors or valves
• Switching lighting, heating, or small motors in building automation
• Replacement for standard 2-pole plug-in relays in existing sockets
• Signal multiplication or isolation in control cabinets

Good to know

The relay is part of the SIRIUS 3TG10 series and plugs into compatible Siemens relay sockets. It operates within a temperature range of -40 to +70 °C, making it suitable for unheated enclosures. The IP40 protection class means it should be installed in a closed cabinet or socket with protective cover.