Yun YY-6CS

Overview

The Yun YY-6CS is a six-outlet surge protector manufactured in July 2006.

The documented example remained in service until retirement and exhibited a flickering illuminated rocker switch during operation.

Inspection prior to documentation revealed significant dirt accumulation, a discolored power plug, and heat damage surrounding one outlet.

Documented Example

OldSurge ID: OS-0012
Manufacturer: Yun
Model: YY-6CS
Manufacturing Date: July 2006

Specifications

Manufacturer: Yun
Model: YY-6CS
Manufacturing Date: July 2006
Device Type: Relocatable Power Tap / Surge Protector
Outlets: 6 grounded outlets
Length: Approximately 10.125 in (25.7 cm)
Width:
- Approximately 2.0 in (5.1 cm) at the control section
- Approximately 1.75 in (4.4 cm) at the outlet section
Power Cord Length: Approximately 28 in (71 cm)
Conductors: 14 AWG × 3
Flame Rating: VW-1
UL File Number (Cord): E247978
Voltage Rating: 125 VAC
Current Rating: 15 A
Frequency: 60 Hz
Suppression Voltage Rating:
- Line-to-Neutral (L-N): 600 V
Country of Manufacture: China
UL File Number: E225774
Power Cord Type: SJT

Physical Description

The YY-6CS utilizes a beige plastic enclosure with six grounded outlets arranged in a single row.

An illuminated red rocker-style power switch is located near the power-cord entry point and is accompanied by bilingual surge-protection labeling.

The enclosure measures approximately:

Length: 10.125 in (25.7 cm)
Width:
- Approximately 2.0 in (5.1 cm) at the control section
- Approximately 1.75 in (4.4 cm) at the outlet section
Cord Length: Approximately 28 in (71 cm)

The printed surge-protection labeling above the rocker switch exhibits noticeable wear and smearing. Some of the lettering was further disturbed during cleaning of the documented example.

One outlet near the end opposite the power-cord entry exhibits significant heat damage and plastic deformation. The affected area includes visible transfer of molded lettering from a previously connected attachment plug, indicating that elevated temperatures were sufficient to soften the surrounding plastic.

The underside incorporates a molded production date wheel indicating manufacture during July 2006.

The YY-6CS uses a screw-fastened enclosure and incorporates underside mounting slots for wall or furniture installation.

A UL hologram affixed to the underside identifies the unit as a listed relocatable power tap.

Mounting Provisions

The YY-6CS incorporates two keyhole-style mounting slots on the underside of the enclosure.

The slot arrangement supports mounting in either horizontal or vertical orientations.

Weight

The documented example weighs approximately 10.6 oz (300 g).

Condition Notes

The documented example exhibits substantial dirt accumulation, a flickering illuminated rocker switch, a discolored attachment plug, and significant heat damage surrounding one outlet near the end opposite the power-cord entry.

The damaged receptacle contains transferred lettering from a previously connected attachment plug. The softened plastic surrounding the outlet preserved portions of the plug's molded markings, indicating that temperatures became sufficiently high to deform the outlet face.

The most severe damage is concentrated around the neutral blade opening of the affected receptacle. This suggests that heating may have originated at the plug-to-receptacle interface rather than within the connected appliance itself. The exact cause could not be conclusively determined, although deterioration of the contact connection is considered a possible contributing factor.

The outlet exhibiting heat damage was not the outlet used by the space heater during the final documented period of service, indicating that the damage likely occurred earlier in the unit's operational life.

The attachment plug exhibits severe heat discoloration and oxidation concentrated around one blade. Green corrosion products and dark thermal staining are visible on the plug body.

The damaged receptacle and damaged plug are not located at opposite ends of the same connection, indicating that more than one connection point may have experienced elevated temperatures during the unit's service life.

Despite evidence of significant heating around one outlet, no corresponding deformation or damage is visible on the underside of the enclosure.

Product Gallery

Overall view of the Yun YY-6CS.
Center outlet section.
Heat-damaged outlet with melted plastic.
Control section and illuminated rocker switch.
Left-side profile view.
Right-side profile view with visible outlet damage.
Cord-entry end with switch and strain relief.
Heat-damaged outlet showing transferred plug markings.
Close-up of outlet damage and transferred plug lettering.
Underside view showing labels, mounting slots, and electrical information.
UL certification hologram and listing information.
Illuminated view of the UL hologram.
Underside specifications and ratings.
Outlet-end underside view.
Date wheel indicating July 2006 manufacture.
Grounded attachment plug and power cord.
Heat-damaged attachment plug.
Close-up of severe heat discoloration and oxidation around the plug blade.
Power cord specifications and manufacturer markings.
Additional power cord specifications.

Testing

The documented example was tested for basic electrical operation and wiring integrity.

Testing with a receptacle tester confirmed correct hot, neutral, and ground wiring. No open ground, open neutral, reversed polarity, or other wiring faults were detected.

The rocker switch successfully controlled power to all outlets.

When energized, the red SURGE indicator illuminated, indicating that surge-protection circuitry remained active.

The illuminated rocker switch exhibited visible flicker during operation while the unit continued to supply power to connected equipment.

YY-6CS connected to power with the rocker switch in the OFF position.
SURGE indicator illuminated during testing.
Outlet tester indicating correct wiring and grounding.

Video

A video demonstrating the flickering illuminated rocker switch is available externally:

Yun YY-6CS flickering rocker switch

Service History

The documented example remained in active service until retirement and documentation by the OldSurge Archive.

Prior to retirement, the surge protector powered a variety of devices including a desktop calculator, paper shredder, and portable space heater.

The heater's attached warning label explicitly instructed users not to connect the appliance through an extension cord or power strip and instead to connect it directly to a wall receptacle.

Teardown

The YY-6CS uses a screw-fastened plastic enclosure secured by six screws.

Following screw removal, disassembly required additional effort due to deformation and adhesion of heat-damaged internal plastic near the affected receptacle. Despite the thermal damage, the enclosure was successfully separated without significant additional breakage.

Internally, the unit employs stamped brass outlet contact strips running the length of the enclosure. Power enters through a rocker switch located at the cord-entry end before being distributed to the outlet bus structure.

A single metal-oxide varistor (MOV) is connected across the line and neutral conductors to provide surge suppression.

The internal construction is typical of cost-sensitive surge protectors of the period, utilizing metal contact strips retained by molded plastic features rather than individual wired receptacles.

YY-6CS opened following removal of the enclosure screws. Internal construction consists of stamped brass outlet contacts, a rocker power switch, and direct-wired surge-protection circuitry.
Six enclosure screws removed prior to disassembly.
Interior view of the upper enclosure half showing the cord-entry area and outlet supports.
Cord-entry section showing the rocker power switch, internal wiring, and surge-suppression components.
Close-up of the rocker switch terminals and surge-suppression components connected across the power conductors.
Interior view of the upper enclosure half at the heat-damaged outlet. Discoloration and deformation are visible around the affected receptacle supports.
Interior view of the outlet-end contact assemblies showing localized deformation associated with the heat-damaged receptacle.
Close-up of the heat-damaged receptacle contact assembly showing melted plastic and deformation surrounding the outlet contact structure.