How to Select an Interface Relay for PLC Outputs
A step-by-step guide to matching PLC output type, coil voltage and current, contact rating, and socket style when selecting an interface relay.
The Siemens 6ED1055-1MB00-0BA2 is a LOGO! 8 DM8 12/24R expansion module that adds 4 digital inputs and 4 relay digital outputs to a LOGO! 8 base module. It accepts 12 V or 24 V DC supply, switches up to 5 A per relay output, and mounts on a 35 mm DIN rail in a 2-module-wide housing.
The relay outputs on the DM8 12/24R rate 5 A resistive per contact, well above the 0.5 A typical of transistor expansion modules, so this variant fits loads like contactor coils or small motor starters directly without an interposing relay. The 12/24 V DC supply range and DC-type inputs make it a drop-in expansion for a 24 V DC LOGO! 8 base module rather than the AC/DC-mixed variants in the same family. Choose the relay-output module over a transistor-output DM8 when the downstream load draws more current or needs galvanic isolation from the LOGO! logic side.
Expands I/O count on machine control panels, small conveyor or pump skids, and building-services logic already built on a LOGO! 8 base module, where the extra 4 relay outputs switch contactors, indicator loads, or solenoid valves directly.
| Mounting | on 35 mm DIN rail, 2 spacing units wide |
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| Rated value (DC): 12 V DC | Yes |
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| Rated value (DC): 24 V DC | Yes |
| permissible range, lower limit (DC) | 10.8 V |
| permissible range, upper limit (DC) | 28.8 V |
| Number of digital inputs | 4 |
|---|---|
| Input voltage: Type of input voltage | DC |
| Input voltage: for signal "0" | < 5 V DC |
| Input voltage: for signal "1" | > 8.5 V |
| Input current: for signal "0", max. (permissible quiescent current) | 0.88 mA |
| Input current: for signal "1", typ. | 1.5 mA |
| Input delay (for rated value of input voltage) for standard inputs: at "0" to "1", max. | 1.5 ms |
| Part number | 6ED1055-1MB00-0BA2 |
|---|---|
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 4034106029456 |
| ETIM class | EC001419 |
| eCl@ss | 27242204 |
| Number of digital outputs | 4; Relays |
|---|---|
| Short-circuit protection | No |
| Controlling a digital input | Yes |
| Switching capacity of the outputs: on lamp load, max. | 1 000 W |
| Output current: for signal "1" rated value | 5 A |
| Output current: for signal "1" minimum load current | 100 mA |
| Parallel switching of two outputs: for uprating | No |
| Switching frequency: with resistive load, max. | 2 Hz |
| Switching frequency: with inductive load, max. | 0.5 Hz |
| Switching frequency: mechanical, max. | 10 Hz |
| Relay outputs Switching capacity of contacts: with inductive load, max. | 3 A |
| Relay outputs Switching capacity of contacts: with resistive load, max. | 5 A |
| Emission of radio interference acc. to EN 55 011: Limit class B, for use in residential areas | Yes |
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| IP degree of protection | IP20 |
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| CE mark | Yes |
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| CSA approval | Yes |
| UL approval | Yes |
| FM approval | Yes |
| developed in accordance with IEC 61131 | Yes |
| Marine approval | Yes |
| Ecological footprint: environmental product declaration Global warming potential | Yes |
| Ecological footprint: global warming potential, (total) [CO2 eq] | 59.1 kg |
| Ecological footprint: global warming potential, (during production) [CO2 eq] | 5.82 kg |
| Ecological footprint: global warming potential, (during operation) [CO2 eq] | 53.6 kg |
| Ecological footprint: global warming potential, (after end of life cycle) [CO2 eq] | -0.373 kg |
| Ambient temperature during operation: min. | -20 °C; No condensation |
|---|---|
| Ambient temperature during operation: max. | 55 °C |
| Width | 35.5 mm |
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| Height | 90 mm |
| Depth | 58 mm |
| Miscellaneous Manufacturer Declara- | tion |
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| Net weight | 0.166 kg |
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| Country of origin | CN |
| Shipping weight | 0.666 kg |
| Ships from | Türkiye |
| Dispatch | 13 Nov |
| Stock | In stock |
Source: manufacturer data · Last verified: 01 Nov 2026
No documents are on file for this part yet.
Ask us for the datasheetThe rated current of 6ED1055-1MB00-0BA2 is 5 A.
The tariff (HS) code on file for 6ED1055-1MB00-0BA2 is 85389091.
The EAN (GTIN) of 6ED1055-1MB00-0BA2 is 4034106029456.
6ED1055-1MB00-0BA2 ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival. Stock items are dispatched within 1–2 business days.
A step-by-step guide to matching PLC output type, coil voltage and current, contact rating, and socket style when selecting an interface relay.
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