eSSL KR503E – 125kHz Proximity Card Reader for Access Control
The eSSL KR503E RFID reader is a compact, high‑performance 125kHz EM proximity card reader designed for secure and reliable access control. Featuring a built‑in Wiegand 26/34‑bit output, IP65 weatherproof casing and a read range of up to 10 cm, the KR503E is the perfect choice for modern access control systems in corporate offices, residential buildings, parking gates and industrial facilities.
📌 What is the eSSL KR503E?
The eSSL KR503E is a 125kHz EM proximity card reader designed for contactless access control. It reads the unique identifier (UID) from standard EM proximity cards and transmits it to an access control panel via the industry‑standard Wiegand 26‑bit (or 34‑bit) output. The KR503E is housed in a rugged, IP65‑rated ABS casing, making it dust‑tight and resistant to powerful water jets. This enables reliable operation in both indoor and outdoor environments, including parking gates, turnstiles, fence entrances and industrial yards. With a read range of up to 10 cm and a reading time of ≤200 ms, the KR503E delivers fast, accurate card reading for a seamless user experience.
The KR503E is part of the KR500 series of Wiegand card readers, trusted by thousands of access control installations worldwide. Its compact dimensions (116 × 75 × 17.3 mm) and low power consumption (standby < 30 mA) make it easy to install on door frames, turnstiles, or gate posts, blending discreetly into any environment. It supports optional external LED and buzzer control, giving integrators flexibility to tailor visual and audible feedback to site requirements [17†L14-L22][10†L9-L12][10†L24-L26].
📊 Technical Specifications – eSSL KR503E
| Product Model | eSSL KR503E (125kHz Proximity Reader) |
|---|---|
| Product Type | RFID Wiegand Card Reader |
| Card Type / Frequency | 125kHz EM Proximity Card (EM4100 series and compatible) |
| Read Range | Up to 10 cm |
| Reading Time (Card) | ≤300 ms (typical) |
| Output Format | Wiegand 26‑bit (default) / 34‑bit (configurable) | Communication Interface | Wiegand (26/34) through physical connection; RS485 for optional communication | Power Supply | DC 6‑14 V (12 V recommended) |
| Operating Current | ≤ 70 mA (max) |
| LED Indicators | Dual‑colour LED (Red and Green) – power and card read status |
| Beeper | Yes (audible feedback on card read) |
| Input Ports | 2 external ports (LED and Buzzer control) |
| Ingress Protection (IP) Rating | IP65 (dust‑tight, protected against powerful water jets) |
| Operating Temperature | -20 °C to +65 °C |
| Operating Humidity | 10% to 90% RH (non‑condensing) |
| Dimensions (W × H × T) | 116 mm × 75 mm × 17.3 mm |
| Housing Material | ABS+PC with texture |
| Mounting Type | Surface / flush mount; designed for single‑gang electrical boxes |
Specifications derived from eSSL Security documentation, ZKTeco product data and independent technical listings.
🔑 Key Features – Why Choose the eSSL KR503E
Compatible with standard EM4100 series 125kHz proximity cards and key fobs – the most widely deployed card technology for access control.
Plug‑and‑play compatibility with any access control panel that accepts Wiegand 26 or 34‑bit input. Works with eSSL C3 controllers, InBio series, and third‑party panels.
Fully dust‑tight and protected against powerful water jets. Ideal for outdoor installations – parking gates, fences, turnstiles, and industrial perimeters where rain, dust, or moisture is present.
Provides a comfortable, forgiving tap zone for users, reducing failed reads and improving the overall access experience.
Standby current ≤ 70 mA and reading time ≤200 ms deliver low operational costs and a frictionless user experience.
Two input ports allow integration of external LED indicators or buzzers, giving system integrators flexibility to tailor visual and audible feedback to site requirements [17†L14-L22][10†L9-L12][10†L24-L26].
Just 116 mm × 75 mm × 17.3 mm, the KR503E fits tightly on door frames, turnstile pillars or standard single‑gang backboxes without protruding intrusively.
Solid epoxy‑potted electronics and reverse polarity protection ensure long‑term reliability and immunity to wiring errors during installation [10†L17-L18][11†L5].
🏢 Where to Deploy the eSSL KR503E Proximity Card Reader
Secure employee doors, server rooms, and administrative offices. The compact flush‑mount design seamlessly integrates into modern door frames.
Install at main pedestrian gates or lift lobbies; residents can use EM proximity cards or key fobs for access. The IP65 rating ensures reliable outdoor operation.
Pair with boom barriers or sliding gates. The KR503E‘s waterproof housing and wide operating temperature guarantee consistent performance at outdoor parking entrances.
Factory entry points, warehouse doors, and tool cribs benefit from the rugged IP65 construction and fast Wiegand output.
Secure laboratory doors, library entry points, and faculty offices with economical, low‑maintenance proximity card readers.
Pharmacy doors, medical record rooms, and restricted staff zones gain reliable outdoor‑rated access control with simple integration into existing security ecosystems.
🌟 Why Choose eSSL for Your Proximity Card Reader Needs?
eSSL has a strong legacy of RFID and biometric security. The KR503E is built on the same reliable platform used in thousands of access control installations worldwide.
The KR503E‘s 26/34‑bit Wiegand output ensures seamless integration with any eSSL or third‑party access control panel, biometric terminal, or door controller – whether you are upgrading an existing system or designing a new one.
With solid epoxy potting and IP65‑rated housing, the KR503E reliably operates outdoors, in dusty manufacturing zones, and in high‑humidity areas where other readers would fail.
Low power consumption (< 70 mA) and durable components reduce long‑term operating costs. Optional annual maintenance contracts (AMC) provide ongoing support and peace of mind.
🔌 Seamless Integration with ERP, HRMS & Payroll Systems
When connected to an eSSL access control panel (e.g., C3‑100, C3‑200, C3‑400, InBio series) or any third‑party Wiegand‑compatible controller, the KR503E captures card events that can be logged into eSSL‘s eTimeTrackLite software. Standard export formats (CSV, Excel) and API support allow integration with leading HRMS, ERP, and payroll platforms, including Spine, GreytHR, HROne, Zoho CRM, Candle, Saral, and Oracle. Our integration team can configure event logging, access records, and audit trails directly into your enterprise software, unifying physical security with workforce management.