Photos show the actual item you will receive.
Product details
About this part
The LOT OF 5 Siemens Lzs : RT78725 / RT4A4L24 is made by Siemens and identified by manufacturer part number RT4A4L24.
This listing is for the exact part number stated above. Compare the part number, condition and photos with your equipment before ordering.
Condition
This item is listed as New. Factory new, in original packaging.
The photos are part of the description — check them for labels, connectors, markings and any visible wear.
What's included
1 × LOT OF 5 Siemens Lzs : RT78725 / RT4A4L24.
Only the items listed here or clearly shown in the photos are included. Cables, manuals, mounting hardware and accessories are not included unless stated.
Identification & compatibility
Check the manufacturer (Siemens), the part number (RT4A4L24) and the photos against your equipment. If you are not sure this is the right part, contact us before you order.
Price match
Found an identical item for less at a fixed price elsewhere? Contact us before you buy with the details, and we will review it.
Important information
Product information is based on what is available for this specific item. Where specifications or compatibility are critical to your application, confirm them before purchase.
- Brand
- Siemens
- Part number
- RT4A4L24
- Model
- RT78725
- Country of Origin
- Germany
- Manufacturer
- Siemens (SIRIUS LZS)
- Components (photos)
- RT424024 relay, LZS:RT78725 socket, red LED module, retaining clip
- Quantity in lot (box label)
- 5
- Contacts
- 2 changeover (2 CO), AgNi 90/10
- Coil voltage
- 24 V DC (operating range 0.9 to 1.4 x rated)
- Thermal current
- 8 A
- DC-13 rating
- 2 A at 24 V
- Switching delay
- Closing 8 ms, opening 6 ms (DC)
- Mechanical life
- 30,000,000 switching cycles (typical)
- Terminals
- Screw type, 1 to 2.5 mm² solid, 0.5 to 0.7 N·m
- Dimensions (datasheet)
- 71 mm H x 15.5 mm W x 78 mm D
- Protection
- IP20
- Standard (box label)
- IEC 61810-1
This is a lot of 5 Siemens LZS:RT4A4L24 plug-in relay complete units: 24 V DC coupling relays with 2 changeover (CO) contacts, a red LED module and a standard plug-in socket with screw terminals. Siemens lists the LZS:RT4A4L24 under the SIRIUS brand as a coupling relay with plug-in relay. Each unit in the photos is built from an RT424024 relay (Schrack, 24 VDC) on an LZS:RT78725 socket.
What is a coupling relay?
A coupling relay (plug-in relay coupler) sits between a control output, such as a 24 V DC PLC output, and the load circuit. The 24 V DC coil switches two changeover contacts, so the control side and the load side stay separate. The red LED shows when the coil is energized.
What is in the box?
The Siemens box label reads LZS:RT4A4L24, Qty 5, 2 CO, DC 24V, IEC 61810-1, Made in Germany. The photos show five complete units with retaining clips, a bag of marker tags, and the Siemens operating instructions for the plug-in relay coupler.
What ratings are printed on the socket?
The LZS:RT78725 socket shows two wiring diagrams marked 16A/250VAC and 8A/250VAC, with CE, VDE and cULus marks. The Siemens datasheet gives 8 A thermal current for the complete unit, AgNi 90/10 contacts and 2 A at 24 V DC-13.
What condition is it in?
New, in the original Siemens box.
- Ships from
- Israel
- Tracking
- Included on every order
Import duties and taxes may apply in your country and are paid by the buyer on delivery.
- Returns
- Accepted within 60 days of delivery
- Return shipping
- Free — paid by us
- Refund
- Money back
Return terms differ from item to item — this item's own policy is shown above.
Whatever it says, an item that arrives faulty or not as described is covered: tell us within 30 days of delivery and we will refund or replace it.
Consumers in the EU, the UK and Israel keep their legal right to cancel within 14 days. Full details and the return request form are on our Returns and warranty page.
Questions about this part
What is the Siemens LZS:RT4A4L24?
A plug-in relay complete unit: a 24 V DC relay with 2 changeover contacts, a red LED module and a standard socket with screw terminals.
What is a coupling relay used for?
It lets a low-power control signal, such as a 24 V DC PLC output, switch a separate load circuit through relay contacts, keeping the two circuits apart.
Which relay and socket make up the unit?
In the photos each unit has an RT424024 relay (Schrack, 24 VDC) plugged into an LZS:RT78725 socket.
How many units are included?
Five. The Siemens box label reads Qty 5 and the photo shows five complete units.
What is the contact rating?
Siemens gives 8 A thermal current and 2 A at 24 V DC-13 for the complete unit. The socket also carries 16A/250VAC and 8A/250VAC markings next to its wiring diagrams.
Does it have an LED?
Yes, a red LED module shows the switching state.
What condition is it in?
New, in the original Siemens box with the operating instructions and marker tags.
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