Din rail solid state relays (SSRs) offer reliable switching for automation and control panels. This article highlights five top SSRs designed for DIN rail mounting, covering DC-to-AC and DC-to-DC options, compact form factors, and built-in heat management. Each product is evaluated on ease of installation, input/output ranges, and suitability for narrow spaces or distribution boxes.
| Product | Brand | Input / Output | Special Feature |
|---|---|---|---|
| LCLCTC Din Rail Solid State Relay with Heat Sink | LCLCTC | DC to AC, 3-32V DC input / 24-480V AC output | Integrated heat sink; narrow 0.964 in width |
| LClCTC (2pcs) Solid State Relay DD 3.3V–24V | LCLCTC | DC input 3-32VDC / DC output 5-60VDC | No heat sink; long service life |
| DIN Rail Relay Solid State MRD-060D2 | Walfront | DC input 4-32VDC / NO DIN Rail Mount | LED indicator; TS-35 rail installation |
| 6.2mm DIN Rail Solid State Relay Module | YWBL-WH | Input 4-32VDC / Output 4-32VDC (isolation up to 4kV) | IP20 case; anti-vibration |
| ReleyWell SSR with Radiator | ReleyWell | DC input 3-32VDC / 24-480VAC output | Built-in heat sink |
LCLCTC Din Rail SSR With Heat Sink
The LCLCTC SSR combines a compact DIN rail footprint with an integrated heat sink, eliminating the need for separate cooling components. It supports a wide input range of 3-32V DC and provides an output range of 24-480V AC, rated at 40A. Mounting clips suit distribution box installations, and its slim width (0.964 inches) is ideal for narrow spaces in control panels. This model suits DC-to-AC switching applications where space efficiency is critical.
Key features include: built-in heat dissipation, rail mounting for quick installation, and a slim profile that fits constrained enclosures. These attributes make it suitable for automation tasks requiring reliable SSR performance without adding extra hardware. Ensure compatible control voltages and load ratings align with system requirements.
LCLCTC DD 3.3V–24V Solid State Relay Duo
This kit includes two SSRs capable of DC-to-DC switching with input voltages from 3 to 32V DC and output ranges of 5 to 60V DC. The design emphasizes long service life with no mechanical contacts, reducing wear. Note that the unit does not include a heatsink, so it is best used within the current limits (up to 1.5A) to avoid overheating.
These modules are well-suited for PLC signal applications where solid-state reliability and compact DIN rail mounting are priorities. Consider your required DC load voltage, current, and overall thermal management to determine if external cooling is necessary in your enclosure.
Walfront DIN Rail Solid State Relay MRD-060D2
The Walfront MRD-060D2 DIN rail relay module emphasizes durability and space-saving installation. It offers a solid-state output with a compact 6.2mm DIN rail footprint and LED input state indicators for quick status checks. The module is designed for TS-35 rail mounting and boasts IP20 shell protection, enabling safer operation in typical control panel environments.
With a DC input range of 4-32V and a NO configuration, this SSR is suitable for logic-level control signals driving higher DC loads. Its compact size makes it a good match for narrow enclosures or control panels with limited mounting space. Always verify the DC load current to ensure it remains within the SSR’s rated capacity.
6.2mm DIN Rail SSR Module by YWBL-WH
This DIN rail SSR module is designed for DC input and DC output with isolation up to 4 kV, featuring an LED input status indicator and an IP20 protective case. Its flame-retardant housing and integrated construction offer resilience in industrial environments. It targets applications such as controlling pneumatic DC solenoid valves, where solid-state switching reduces wear and electrical noise.
Recommended usage involves verifying input control signals (3–32 V DC) and ensuring the DC output voltage aligns with the load. The module’s compact dimension, robust isolation, and vibration resistance make it appropriate for small automation panels that require dependable DC switching at relatively low voltages.
ReleyWell SSR with Radiator
The ReleyWell solid-state relay provides a DC input range of 3-32V DC and a DC-to-AC output range of 24-480 VAC, rated at 25A. The model includes a heat sink, addressing thermal management for continuous operation in demanding applications. This SSR is suitable for motor control or other inductive loads where heat dissipation is a concern.
When integrating this SSR, consider the thermal load, enclosure ventilation, and the need for heat sinking in your control panel. Its built-in radiator helps maintain performance under higher duty cycles, reducing the risk of overheating during extended operation.
Buying Guide
- Input voltage compatibility: Ensure the SSR’s input range matches your control signal (DC 3-32V is common). Some models are designed for 3-32V DC control and DC output, while others support AC load switching (AC-AC).
- Output current and voltage: Confirm the maximum load current (e.g., 25–40A) and the output voltage range (DC or AC) to suit your application. Exceeding ratings can reduce reliability or cause failure.
- Thermal management: SSRs with built-in heatsinks or radiators handle higher duty cycles and larger loads. If space is tight, models with integrated cooling can simplify panel design.
- DIN rail mounting compatibility: Verify TS-35/DIN rail compatibility and whether LED indicators are included for quick status checks in maintenance scenarios.
- Space and enclosure considerations: Slim-profile SSRs fit narrow panels, while broader units may require deeper enclosures or additional clearance for airflow.
- Isolation and safety: Look for isolation voltage (up to 4 kV in some models) and IP ratings to ensure safe operation in industrial environments.
- Reliability and endurance: SSRs with no moving parts and long service life are preferable for high-cycle applications, but some DC-only models may have limitations on current without heat sinking.
- Application fit: For DC-to-AC control (DC input, AC output), ensure the SSR supports the intended load type (inductive, resistive) and duty cycle.
- Cost-benefit considerations: While a heatsink adds cost, it can reduce temperature rise and extend product life in continuous operation scenarios.