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The Rki 057: A Deep Dive into the Enigmatic German Relay and Its Industrial Legacy

In the vast, often overlooked world of industrial electronics, certain components achieve a kind of legendary status. Not because they are flashy or consumer-facing, but due to their unwavering reliability, distinctive design, or sheer longevity. The Rki 057 is one such component. While not a household name, for electrical engineers, restorers of vintage German machinery, and collectors of Cold War-era automation technology, the Rki 057 represents a gold standard in electromechanical relay design.

This article provides a comprehensive exploration of the Rki 057. We will dissect its technical specifications, trace its origins, examine its common applications, and discuss why, decades after its initial production, it remains a highly sought-after component on the secondary market.

5. Maintenance and Lubrication

Proper maintenance extends the life of the RKI 057 significantly. Rki 057

• Lubrication Type: Use a high-quality mineral oil or synthetic oil specifically designed for roller chains. Avoid greases that cannot penetrate the pin-bushing joint.
• Frequency: Lubrication should occur every 8 hours of operation in dirty environments, or continuously via an oil bath/drip system if the application allows.
• Inspection: Check for:
  • Stiff Joints: Links that do not articulate freely.
  • Elongation: Measure the chain length over a specific number of pitches. If it has stretched beyond 2-3%, it should be replaced to prevent sprocket damage.
  • Corrosion: Pitting or rust on the plates.

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Secondary Market (Use Caution):

• eBay or Amazon Business – Only acceptable for discontinued, NOS (New Old Stock) units. Demand photos of the original seal packaging.
• Local hydraulic repair shops – They may offer rebuilt Rki 057 units. Acceptable only if they provide a test report showing leak rate ≤ 1 cc/min.

Step-by-Step Testing Procedure

If you have acquired an Rki 057 and want to ensure it works, follow this procedure:

1. Visual Inspection: Check for cracked plastic, rust, or burnt smell.
2. Identify the Coils: Use a datasheet or an ohmmeter to find the "Set" and "Reset" coil pins. Also locate the Common (C), Normally Closed (NC), and Normally Open (NO) contacts.
3. Impedance Check: Measure coil resistance. For a 24V DC unit, expect roughly 400-600 ohms. An open circuit (infinite ohms) means a dead coil.
4. Pulse Test: Using a current-limited DC power supply (e.g., set to 24V, limit 100mA), briefly touch the "Set" coil.
   • You should hear a crisp click.
   • Check continuity between COM and NO. It should be a short (0 ohms).
   • COM and NC should be open.
5. Reset Test: Pulse the "Reset" coil. The relay should click back, reversing the contact states.
6. Hold Test: Remove all power. Vigorously tap the relay. If it switches positions, the internal magnet is weak. This unit is not reliable for industrial use.

What to Avoid:

• Sellers listing "Rki 057 compatible" without a manufacturer name.
• Prices below $15 USD (genuine units start at $42 for basic models, up to $210 for stainless steel sanitary versions).
• No return policy or warranty period (<90 days).

1. Identification and Overview

The RKI 057 is a part number format used by Renold for their high-performance industrial chains. The Rki 057: A Deep Dive into the

• Manufacturer: Renold PLC
• Series: RKI (Renold Kempton Index) – typically associated with their British Standard or high-specification roller chains.
• Type: Typically a Duplex (Double Strand) Roller Chain.

Maintenance Schedule:

• Monthly: Check for external corrosion or audible hissing (leaks).
• Quarterly: Remove the bowl (if equipped) and clean with isopropyl alcohol.
• Annually: Replace the repair kit (often sold as "Rki 057-SERVICE") which includes a new diaphragm, valve seal, and O-rings.