The KR503H is a compact 125kHz proximity card reader built for installs where space is tight. Its slim profile fits narrow door frames, thin-wall boxes, and anywhere a standard-depth reader won't land without shimming. Seal it with epoxy potting and it holds up in harsh or exposed environments.
Built for the commercial installer
Wiegand output keeps it compatible with virtually any access control panel already on the job. Multiple 125kHz proximity card formats are supported, so dealers aren't locked into a single credential ecosystem. No extra configuration required at the reader itself.
Key features
- Compact form factor: small enough for thin mounting areas where standard readers won't fit
- Weather-resistant: sealing with epoxy potting protects the reader in demanding environments
- Multi-credential: supports multiple 125kHz proximity card formats including EM
- Standard Wiegand output: integrates with a wide range of existing access control panels
System requirements
Requires a Wiegand-compatible access control panel or controller. Standard power and data wiring apply -- no proprietary cabling or hub required.
Brand:
ZKTeco USA
What card formats does the KR503H support?
The KR503H reads multiple 125kHz proximity card formats, including standard EM (EM4100/EM4200) cards. Confirm compatibility with your specific credential before ordering if using a proprietary 125kHz format.
Is the KR503H weather-resistant?
Yes, when sealed with epoxy potting. The reader itself is designed for harsh environments, but epoxy potting is required to achieve weather protection. Factor this into your install plan.
What communication protocol does it use?
Wiegand output -- the industry standard for access readers. Compatible with virtually any access control panel that accepts a standard Wiegand input.
Why choose the KR503H over a standard-size reader?
Its compact footprint makes it the right call for thin mounting surfaces, narrow door frames, or anywhere a full-depth reader creates clearance issues. Same Wiegand output, smaller punch-out.
