--- product_id: 55049855 title: "RCD switch - Residual current breaker 4-p DFS4 125-4/0,50-B SK" brand: "doepke" price: "€ 0.25" currency: EUR in_stock: false url: https://www.desertcart.pt/products/55049855-rcd-switch-residual-current-breaker-4-p-dfs4-125-4 store_origin: PT region: Portugal --- # 400V Voltage 125A Current 0.5A Residual RCD switch - Residual current breaker 4-p DFS4 125-4/0,50-B SK **Brand:** doepke **Price:** € 0.25 **Availability:** ❌ Out of Stock ## Summary > 🔒 Secure Your Power, Elevate Your Safety! ## Quick Answers - **What is this?** RCD switch - Residual current breaker 4-p DFS4 125-4/0,50-B SK by doepke - **How much does it cost?** € 0.25 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/55049855-rcd-switch-residual-current-breaker-4-p-dfs4-125-4) ## Best For - doepke enthusiasts ## Why This Product - Trusted doepke brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Safety First:** Protects against electrical faults with precision. - • **Trusted Brand:** Manufactured by Doepke, a leader in electrical safety. - • **Compact Design:** Easily fits on DIN rails for seamless installation. - • **High Performance:** Rated for 125A, ensuring robust power management. - • **Reliable Protection:** 0.5A residual current rating for enhanced safety. ## Overview The RCD switch - Residual current breaker 4-p DFS4 125-4/0,50-B SK by Doepke is a high-performance electrical safety device designed for professional use. With a rated voltage of 400V and a current capacity of 125A, it ensures reliable protection against electrical faults. Its compact design allows for easy installation on DIN rails, making it a must-have for any modern electrical setup. ## Description FI switch DFS4 125-4/0.50-B SK, number of poles=4, rated voltage=400 V, rated current=125 A, rated residual current=0.5 A, rated insulation voltage Ui=400 V, rated impulse withstand voltage Uimp=4 kV, mounting type= DIN rail, residual current type=B, selective type=no, short-time delay type=yes, short circuit strength (Icw)=10 kA, surge current strength=3 kA, voltage type=AC, with locking device=no, frequency=50 Hz, additional devices possible =yes, protection class (IP)=IP20, width in pitch units=4, installation depth=69 mm, ambient temperature during operation=-25..40 °C, degree of pollution=2, connectable conductor cross-section multi-wire=1.5..50 mm², Connectable conductor cross-section solid = 1.5..50 mm², explosion-proof = no, residual current circuit breakers (RCCB) switch off the power supply if dangerously high residual currents occur. In this way, you protect people, animals and systems. DFS 4 are two- or four-pole residual current circuit breakers for single- or three-phase networks. In the standard version, the compact devices are four modules wide. They are available with many different residual current types and designs with rated currents up to 125 A. The large double-decker terminals can also accommodate large conductor cross-sections. The triggered position of the multifunction switch toggle makes troubleshooting easier. The free label software helps with labeling. Type B switches are AC/DC sensitive at frequencies from 0 Hz (smooth DC residual currents) to 150 kHz. They are more resistant to surge currents and thunderstorms. Residual current circuit breakers from the SK series stand for residual current protection and high system availability. They are characterized by a lower response sensitivity at higher frequencies. The SK characteristic curve is optimized for systems in which fire protection is not required. Standard version devices are designed for monitoring circuits with a rated voltage of 230 V/400 V and a rated frequency of 50 Hz. ## Features - Number of Terminals: 4 - Rated Voltage: 400 V - Rated Current = 125 A - Rated Residual Current = 0.5 A - Installation = Size rail ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | Doepke | | Part number | 09177998 | | Item Weight | 490 g | | Product Dimensions | 10 x 10 x 10 cm; 490 g | | Item model number | 09177998 | | Voltage | 400 Volts | | Item Package Quantity | 1 | | Number of Pieces | 1 | | Plug profile | DIN Rail Mount | | Batteries included? | No | | Batteries Required? | No | ## Images ![RCD switch - Residual current breaker 4-p DFS4 125-4/0,50-B SK - Image 1](https://m.media-amazon.com/images/I/41vs4YpVxRL.jpg) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pt/products/55049855-rcd-switch-residual-current-breaker-4-p-dfs4-125-4](https://www.desertcart.pt/products/55049855-rcd-switch-residual-current-breaker-4-p-dfs4-125-4) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-06-22*