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Catalog # 303521 - Model 4521 HD15 A/B Network Switch

    HD15 A/B Network Switch
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Base Price:
Catalog No: 303521
Model No: 4521
Product Type:Switches: Copper
Cable Type/Port Connector:HD15 Switch Ports
Channels per Switch Chassis:1
Electronic Switches/Power Required:PathWay® Copper
Remote Control:Contact Closure
Pins Switched:15
Remote Port:DB9
Local Control:Pushbutton


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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Path Way® Remotely Controllable Network Switch
Model 4521 Single Channel HD15 A/B Switch with Contact Control Remote Port

The PathWay® Model 4521 Single Channel HD15 A/B Network Switch allows a device connected to COMMON port access to the A or B port. The M4521 network switch may be controlled locally by manually operating the front panel pushbutton or remotely from the DB9 contact control Remote port. The DB9 Remote port provides control by dry contact open/closure logic. The front panel LED display indicates the switch position and unit power status.


  • PORT CONNECTORS: (3) HD15 (F) connectors for ports A, B, and COMMON.
  • REMOTE: (1) DB9 (F) connector on rear panel allows remote switch control via contact closure.
  • LOCAL CONTROL: (1) Pushbutton for local switch control.
  • DISPLAY: (2) LEDs on front panel indicate switch position.
  • POWER: The unit requires 24 volts DC power supplied to pins 7 and 8 of the Remote connector.
  • DIMENSIONS: 7.8" W x 2.9" H x 7.25" D.
  • WEIGHT: Approx. 3 lbs.

APPLICATION: DB15 Network Switch with a DB9 Contact Closure Remote. 

Model 4521 Single Channel HD15 A/B Switch with Contact Control Remote Port


  • Model 4521 AB network switch allows a device connected to COMMON port access to the A or B port.
  • Control manually via pushbutton.
  • Control remotely via DB9 Contact Control Remote port.
  • The DB9 Remote port provides control by dry contact open/closure logic.
  • Front panel LED displays switch position and power status.
  • All 15 signal lines of each HD15 port connector are switched and are transparent to all data.

This high-quality network switch is available to city, state, and federal government purchasers at a discounted price and favorable payment and shipping terms via GSA Schedule GS-35F-0286V. Click here for GSA terms.

Electro Standards can supply 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 custom product request form.

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 availabe for export.

Electro Standards welcomes International inquiries: commutateur de données, interruptor de datos, dati interruttore, Przelacznik danych, comutador de dados.

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