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Catalog # 304030 - Model 8253 DB25 2-Position Switch

    DB25 2-Position Switch
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Catalog No: 304030
Model No: 8253
Product Type:Switches: Copper
Cable Type/Port Connector:DB25 Switch Ports
Channels per Switch Chassis:1
Manual Control/No Power Required:LineSelect® Manual Operation
Pins Switched:2-25, Pin 1 Bussed Thru
Local Control:Rotary Knob


Shipping Terms

Shipments are made via UPS Ground, unless otherwise specified. Freight charges are prepaid and added to your invoice. We can estimate the freight costs for you.

We can ship freight collect on your account, just provide your UPS Account Number.

We can also ship via the carrier of your choice. Provide the details and your account number.

Products shall be shipped F.O.B. Electro Standards' facility. Title to and risk of loss or damage to the products shall pass to you upon Electro Standards delivery of the products to a carrier for shipment. Title to software will remain with the applicable licensor. Electro Standards' prices do not include shipping and handling charges. Electro Standards reserves the right to use its own discretion in the manner and routing of shipments. Electro Standards shall be permitted to deliver products in separate lots.

Shipping Return Policy

  • To return an item, contact Electro Standards at 401-943-1164 to obtain a Return Material Authorization (RMA) number. RMA numbers are valid for 30 days after the date of the shipment and cannot be extended or re-issued. We are unable to accept returns without an RMA number.
  • All returns except those of defective product are subject to a 15% restocking fee, and additional charges for handling or freight are refunded only in cases of defective products.
  • Return freight must be shipped prepaid. We recommend that you insure the package as you are responsible for risk of loss on all returned packages. We recommend that all cartons are properly packed as Electro Standards is not responsible for product damaged en route. We do not issue call tags for product returns.
  • Returned product must be clean, undamaged, and complete with all manuals, accessories, documents and packaging. The items must be in a resalable condition.
  • The product must have with it a copy of the original invoice or packing slip and the appropriate RMA paperwork.
  • If your item is not working properly, please contact Electro Standards at 401-943-1164 for help in trouble-shooting your application.
  • If the product is defective, Electro Standards will repair or replace that item (at our discretion) upon receipt and evaluation of the original product.
  • Electro Standards reserves the right to authorize product returns after 30 days from the invoice date in some cases. If the product is accepted after 30 days, credit will be issued toward future pruchases only and some additional restocking charges may be applied.
  • All credits from RMAs must be used within one calendar year of issue.

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DB25 Manual Network Switches, 2-Positions, Rotary Switches
Model 8253 RS232 DB25 A/B Switch, Manual Operation, Desktop

  • No Power Required.

  • Ideal for Fallback Switch Applications. Keep data flowing!


  • PORT CONNECTORS: (3) DB25 female connectors labeled A, B, and COMMON.
  • FRONT PANEL CONTROLS: (1) Rotary Switch allows local switching.
  • POWER: Manually operated. No power required.
  • DIMENSIONS: 5.25"W x 2.0"H x 7.25"D. (13.3 x 5.1 x 18.4 cm)
  • WEIGHT: Approximately 1.0 lb. (0.45 kg.)

LineSelect® Model 8253 RS232 DB25 Fallback application

The LineSelect® Model 8253 diagram illustrates a COMMON device connected to the DB25 port having access to either of two DB25 devices; Device A connected to port A (The Primary Line) and Device B connected to port B (The Backup Line). 

LineSelect® Model 8253 DB25 A/B Switch application


  • Allows access to two RS232 networks from one computer or workstation.
  • High reliability sealed switch with self-wiping precious metal contacts.
  • Eliminates the need to plug and unplug cables.
  • No external power required.
  • Transparent to data speed and format.
  • Manual operation via front panel rotary switch.
  • Attractive anodized black box packaging provides EMI/RFI shielding.
  • Switches pins 2 through 25 of the DB25 interface via break-before-make rotary switch.
  • All pins 1's (Protective Ground) are tied together and bussed through to eliminate surges.
  • Improves computer network efficiency by allowing sharing of peripherals.
  • Custom length DB25 cables available for your switch installation.
  • Lifetime guarantee against manufacturing defects.

The LineSelect® Model 8253 allows the user to access two RS232 DB25 devices connected to the A and B ports from one DB25 device connected to the COMMON port.  Switching between devices A and B is quick and easy via the front panel rotary selector.  The LineSelect® Model 8253 is packaged in a slim desktop style enclosure. No need to plug and unplug cables.  No chance for network reconfiguration errors. 

Ask about our popular Model 700 RS-232 Breakout Box.
Tri-State LED's monitor the data interface for fault isolation

Model 700 RS232  Breakout Box

Electro Standards can supply all your Network Cable requirements. Click here to reach our CABLES, COPPER NETWORK Webpage.

For custom network switches call our friendly customer support staff at 401-943-1164, email eslab@electrostandards.com, or complete our online form: /Products-Custom/Copper-Switch/

All data switches, data communication products, and data acquisition products are subject to a one year warranty against manufacturing defects.  The limit of ESL liability is limited to the cost of the ESL product provided.

*Prices online are subject to change and verification.

All ESL products are available for export.

Electro Standards welcomes International inquiries: commutateur d'ordinateur,  equipo interruptor, interruttore del calcolatore, interruptor do computador, dator switch.

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