Overview
The WEIDMULLER RSSD 800390 is an electromechanical interface relay module that provides signal isolation and power amplification between low-power control systems (e.g., PLCs) and high-power field actuators. It allows a low-voltage, low-current signal to safely switch larger loads while protecting sensitive electronics from surges, transients, and ground loops. Its compact, DIN rail-compatible design supports high-density panel mounting, making it a reliable solution for industrial control cabinets.
Technical Data
| Parameter | Specification |
|---|---|
| Model Number | RSSD 800390 |
| Component Type | Electromechanical Interface Relay Module |
Typical Applications
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Solenoid Valve Control: Switch AC solenoids via a safe 24 VDC PLC output while suppressing back EMF.
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Motor Contactor Interfacing: Drive contactor coils or soft-starter circuits with isolation from the control system.
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Signal Isolation for DCS/PLC: Prevent electrical noise from reaching sensitive controllers in SCADA or distributed control systems.
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Pilot Lamps & Indicators: Safely switch AC panel lights, horns, or alarms using low-voltage control signals.
The LED status indicator provides immediate visual feedback for operation and troubleshooting.
FAQ
Q1: What is “Galvanic Isolation” for this relay?
A1: The input (coil) and output (contacts) circuits are electrically separate. Signals are transferred magnetically, protecting the PLC from high voltages or noise on the load side.
Q2: Why is the free-wheeling diode important?
A2: When the coil turns off, the collapsing magnetic field generates a high-voltage spike. The diode safely dissipates this spike, preventing damage to the PLC output transistor.
Q3: What does “1 C/O” mean?
A3: “1 C/O” is a Single Pole Double Throw (SPDT) contact: one common terminal connects to Normally Open (NO) when energized or Normally Closed (NC) when de-energized, providing flexible switching options.
| Quick Quotes | Receive price & availability FAST from our dedicated customer service team. |
|---|---|
| Delivery | Expedited, Freight, And International Shipping Available. |
| Condition | 100% New with Original Package |
| Payment | We accept American Express, Discover, MasterCard, PayPal, and Visa. Our site is secured by RapidSSL. |
| Shipping Port | ShangHai, Xiamen |
| Warranty | 12 Months |
| Q: Is Our Pricing Competitive? |
| A: Yes, we collaborate with over 50 countries worldwide. As a top supplier in China, we offer significant discounts based on market trends. |
| Q: What Is the Warranty Period? |
| A: All our new and original products come with a standard one-year warranty. |
| Q: What Payment Methods Do We Accept? |
| A: We require 100% T/T (Telegraphic Transfer) payment before shipping. For items with a lead time, a 30% deposit is needed upfront, and the remaining 70% is due before shipping. If you have a representative in China, you can arrange an RMB transfer through them. |
| Q: What Shipping Methods Do We Use? |
| A: We primarily use FedEx, DHL, UPS, and BRE for shipping. If you have an account with any of these carriers, you can handle shipping directly. We also offer free shipping to China-based freight forwarders. |
| Q: What Is Our Delivery Time? |
| A: Delivery usually takes 1-3 days after receiving the initial payment. For items with a lead time, shipping will occur according to the specified schedule. |
| Q: How Do We Package the Goods? |
| A: We ensure safe packaging with multiple layers of protection. Products are first placed in their original boxes and sealed with labels. A layer of bubble wrap is then added for collision protection during transit. Finally, the items are packed securely in durable boxes. |
| Q: How Can Customers Contact Us and Request a Quote? |
| A: You can reach out to us via email, WhatsApp, WeChat, Skype, or your preferred communication platform. Contact us with your needs, and we'll provide a prompt, customized quote. |
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