Stop and Go Loading Dock Safety Light with Switch and Flasher SG20

“The “”Stop & Go”” Loading Dock Safety Light with Switch and Flasher (SG20) consists of a housing and two lamps designed for use beside the loading dock door on the inside of the building. Three leads exit the back of the light; a common shared by both lights, a hot for the red lamp and a hot for the green lamp (115 VAC also have a ground.) It includes a three way toggle switch on the bottom of the housing. Flip the switch one way and the green light comes on; flip it the other way and the red light illuminates. The center position turns the light off. The SG20 also has a flasher built into the unit. Electrical installation consists of two power leads (plus a ground for 115 VAC.)

The SG20 is also available without a toggle switch (indicated by “”NS”” in the part number) for installations utilizing a remote switch for automation of the light. When installed this way, the light can be set to automatically change colors after a door is opened. Remote switches can be obtained from an electrical contractor or installation professional; they are not offered by Tri Lite.”

Key Features

  • Provides immediate and recognizable direction to drivers and loading dock staff, reducing the risk of confusion and error
  • Can be used anywhere a visual communication system is needed
  • Available in two colors: safety yellow or black
  • Polypropylene housing will not rust, pit, dent, or corrode like similar metal units
  • Choice of incandescent or LED lamps
  • No switch option available for customers who want to supply their own controls
  • Rated for indoor or outdoor use, IP54
  • Note: All incandescent “Stop & Go” lights must flash to prevent warping. It is not necessary for LED lights to flash.
Part NumberVoltageAmpsHousing ColorLamp Type
SG20-12RG12 VDC2.17YellowIncandescent
SG20B-12RG12 VDC2.17BlackIncandescent
SG20-12RG-LED12 VDC0.07YellowLED
SG20B-12RG-LED12 VDC0.07BlackLED
SG20-24RG24 VDC1.1YellowIncandescent
SG20B-24RG24 VDC1.1BlackIncandescent
SG20-24RG-LED24 VDC0.08YellowLED
SG20B-24RG-LED24 VDC0.08BlackLED
SG20-115RG115 VAC0.21YellowIncandescent
SG20-115RGNS*115 VAC0.21YellowIncandescent
SG20B-115RG115 VAC0.21BlackIncandescent
SG20-115RG-LED115 VAC0.04YellowLED
SG20-115NS-LED*115 VAC0.04YellowLED
SG20P-115RG-LED**115 VAC0.04YellowLED
SG20B-115RG-LED115 VAC0.04BlackLED
SG20B-115NS-LED*115 VAC0.04BlackLED
SG20BP-115RG-LED**115 VAC0.04BlackLED
* Model comes without a toggle switch for installations utilizing a customer-supplied remote switch.
** Model supplied with 3-prong power cord.
Stop & Go Product Information SheetDownload
Stop & Go Signalleuchten für Laderampen (Deutsch)Download
Stop & Go Systèmes de Signalisation (Français)Download
SG20 Installation Instructions (English/French)Download
SG20 Wiring Diagram (English/French)Download
SG20 No Switch Model Installation Instructions (English/French)Download
SG20 No Switch Model Wiring Diagram (English/French)Download

Special Features

Swing Hinge

Swing Hinge Dock Light Arm

“Swing” dock lights feature a hinge that allows both vertical and horizontal adjustment of the arm.

Flex Head

Flex Arm Dock Light
Flex dock lights combine the strength of a standard dock light arm with the added flexibility of an impact absorber that bends the head away when bumped by a moving forklift or dock door.

Heavy Duty

Heavy Duty Dock Light
Heavy duty lamp heads are designed for the most demanding environments including wet and damp locations. Their rugged cast aluminum housing includes a shatterproof polycarbonate lens cover.


Fan Only Dock Light

Fans can be used separately or in conjunction with many Tri Lite dock light heads. The high capacity 3-speed fan provides air circulation and cooling throughout the trailer. 18″ fan rated for 3000 cfm.

Loading Dock Light Heads

Heavy Duty Lamp Head (HLED)

Heavy Duty Lamp Head (HLED)
Virtually indestructible! The HDLED has a cast aluminum body designed for the most demanding environments including wet and damp locations.

Metal Lamp Head

Metal Lamp Head
Traditional, powder coated metal light head featuring all steel construction for long life.

Polycarbonate Lamp Head

Polycarbonate Lamp Head
Unique, patented polycarbonate head is rugged and economical, it’s our most popular lamp head!

Arm Type

Single Strut Arm

Single Strut Arm

Single Struct arms are an economical lighting solution for low to mid volume loading docks. The arm features a hinge that allows both vertical and horizontal adjustment of the arm.

Double Strut Arm

Dual struts give this arm the strength to survive in the busiest and most demanding warehouses. The dual strut design will also support a fan or light/fan combination.
How to Specify Dome Color
How to Pick Dome Color
Contact us by Email
Tri Lite values your privacy. Your name and information will never be rented or sold. The information you provide is for Tri Lite’s internal use only
TRI LITE Inc, is an Essential Business During Covid-19 (CORONAVIRUS) Learn More