Ubiquiti UA-G3-FLEX-B vs Kantech KT-SIG-20KTKS-01: Specification Comparison
Both the Ubiquiti UA-G3-FLEX-B and the Kantech KT-SIG-20KTKS-01 are wall-mount access control readers with integrated keypads, designed for multi-factor authentication in commercial and light-industrial environments. The UA-G3-FLEX-B is a PoE-powered NFC/Bluetooth reader from Ubiquiti's Access platform, while the KT-SIG-20KTKS-01 is a HID Signo 20K mullion-style proximity reader from Kantech supporting Wiegand and RS-485 output. Buyers evaluating door-edge readers with card-plus-PIN capability for new or existing access control infrastructure will commonly cross-shop these two units.
In This Guide
- Which reader supports the credential types and authentication methods your deployment requires?
- How do these readers connect to the access control system and how are they powered?
- Are these readers rated for the installation environment, and do they carry the certifications your project requires?
- Which should you choose: the UA-G3-FLEX-B or the KT-SIG-20KTKS-01?
- Side-by-Side Specs
- FAQ
Which reader supports the credential types and authentication methods your deployment requires?
The UA-G3-FLEX-B reads NFC (13.56 MHz), Mifare, and Bluetooth 4.1, and also supports Apple Touch Pass for iOS/Android mobile unlock — all confirmed in the spec sheet. Its 12-button capacitive keypad enables PIN-based multi-factor entry. Bluetooth 4.1 support adds a hands-free or mobile wallet credential tier not present in the Kantech unit.
The KT-SIG-20KTKS-01 covers a broader legacy credential stack: Mifare (13.56 MHz smart card), HID 20-bit proximity (125 kHz), NFC/13.56 MHz, and standard 125 kHz prox cards. This makes it backward-compatible with existing HID prox card populations — a common requirement in retrofit projects. Its integrated keypad supports dual-factor card-plus-PIN. No Bluetooth or mobile wallet credential support is listed in the provided specs.
How do these readers connect to the access control system and how are they powered?
The UA-G3-FLEX-B uses a single RJ45 port (10/100 Mbps Ethernet) connecting directly to a UniFi Access controller. It is powered by PoE 802.3af at 5W over the same cable, requiring no separate power supply or data wiring run. This simplifies installation to a single Cat5e/Cat6 drop per door. Management is application-based through the UniFi ecosystem.
The KT-SIG-20KTKS-01 uses Wiegand and RS-485 communication interfaces — the industry-standard outputs for integrating with third-party access control panels, including Kantech panels and most other major brands. No PoE, Ethernet, or IP-based connectivity is listed in the provided specs. Power source, voltage range, and power consumption figures are not specified in the available data, which buyers should confirm with the manufacturer or distributor before installation planning.
Are these readers rated for the installation environment, and do they carry the certifications your project requires?
The UA-G3-FLEX-B carries an outdoor weatherproof environmental rating with an operating temperature range of -30 to 60°C. Its enclosure is polycarbonate, glass, and aluminium alloy. Certifications listed include CE, FCC, IC, UL 294, and CAN/ULC-60839-11-1 — covering both US and Canadian compliant access control reader standards. NDAA compliance is confirmed in the spec data.
The KT-SIG-20KTKS-01 is specified as a mullion-mount reader suited for glass door frames, indicating an indoor-primary design profile. No operating temperature range, environmental ingress rating (IP rating or equivalent), or specific certifications are listed in the available spec data. Country of origin is listed as US. Buyers with outdoor, harsh-environment, or certification-specific project requirements should request the full HID Signo 20K datasheet to verify suitability.
Which should you choose: the UA-G3-FLEX-B or the KT-SIG-20KTKS-01?
Our take: The UA-G3-FLEX-B is the stronger choice when deploying a cloud-managed, IP-native access control system with outdoor exposure and mobile credential requirements. It operates at -30 to 60°C with UL 294 and CAN/ULC-60839-11-1 certifications, draws only 5W over a single PoE 802.3af cable, and adds Bluetooth 4.1 plus Apple Touch Pass beyond NFC and PIN — capabilities not listed for the KT-SIG-20KTKS-01. Conversely, the KT-SIG-20KTKS-01 is the appropriate selection for panel-based access control infrastructure relying on Wiegand or RS-485 outputs, particularly where existing HID 125 kHz prox card populations must be retained — a credential tier the UA-G3-FLEX-B does not support. The Kantech unit's mullion form factor also suits narrow glass-door frames where the UA-G3-FLEX-B's wall-mount profile may not fit. Platform lock-in is the decisive qualifier: the UA-G3-FLEX-B requires a UniFi Access ecosystem; the KT-SIG-20KTKS-01 integrates with Kantech panels and broad Wiegand-compatible infrastructure.
Side-by-Side Comparison
Spec-for-spec, from manufacturer data.
| Specification | Ubiquiti UA-G3-FLEX-B | Kantech KT-SIG-20KTKS-01 |
|---|---|---|
| Form Factor | Wall Mount | Mullion Mount |
| Credential Types | NFC, Mifare, Bluetooth 4.1, Apple Touch Pass, PIN | Mifare, HID 20-bit Prox, NFC/13.56MHz, 125kHz Prox, PIN |
| Keypad | 12-button capacitive | Integrated keypad (button count not specified) |
| Communication Interface | 10/100 Mbps Ethernet (RJ45) | Wiegand; RS-485 |
| Power Method | PoE 802.3af | Not specified in available specs |
| Power Consumption | 5W | — |
| Voltage Input | 44–57V DC | — |
| Operating Temperature | -30 to 60°C | — |
| Environmental Rating | Weatherproof (outdoor-rated) | — |
| Enclosure Material | Polycarbonate, glass, aluminium alloy | Not specified in available specs |
| Weight | 0.400 lb | 0.36 lb |
| Certifications | CE, FCC, IC, UL 294, CAN/ULC-60839-11-1 | — |
| NDAA Compliant | Yes | — |
| Country of Origin | CN | US |
| Mobile Credential Support | iOS, Android (NFC + Bluetooth/Apple Touch Pass) | — |
| Ecosystem / Controller | UniFi Access (application-managed) | Kantech panel; Wiegand-compatible panels |
Frequently Asked Questions
Which should you choose: the UA-G3-FLEX-B or the KT-SIG-20KTKS-01?
The UA-G3-FLEX-B is the stronger choice when deploying a cloud-managed, IP-native access control system with outdoor exposure and mobile credential requirements. It operates at -30 to 60°C with UL 294 and CAN/ULC-60839-11-1 certifications, draws only 5W over a single PoE 802.3af cable, and adds Bluetooth 4.1 plus Apple Touch Pass beyond NFC and PIN — capabilities not listed for the KT-SIG-20KTKS-01. Conversely, the KT-SIG-20KTKS-01 is the appropriate selection for panel-based access control infrastructure relying on Wiegand or RS-485 outputs, particularly where existing HID 125 kHz prox card populations must be retained — a credential tier the UA-G3-FLEX-B does not support. The Kantech unit's mullion form factor also suits narrow glass-door frames where the UA-G3-FLEX-B's wall-mount profile may not fit. Platform lock-in is the decisive qualifier: the UA-G3-FLEX-B requires a UniFi Access ecosystem; the KT-SIG-20KTKS-01 integrates with Kantech panels and broad Wiegand-compatible infrastructure.
Can the UA-G3-FLEX-B or KT-SIG-20KTKS-01 work with my existing HID prox cards?
The KT-SIG-20KTKS-01 explicitly lists HID 20-bit proximity (125 kHz) and 125 kHz prox as supported credential types, making it compatible with legacy HID prox card populations. The UA-G3-FLEX-B supports NFC (13.56 MHz), Mifare, and Bluetooth 4.1 — 125 kHz HID prox is not listed in the provided specs. If your site uses legacy HID prox cards, the KT-SIG-20KTKS-01 is the confirmed-compatible option.
Which reader is better suited for outdoor installation?
The UA-G3-FLEX-B is explicitly rated for outdoor use with a weatherproof enclosure and an operating temperature of -30 to 60°C, backed by UL 294 and CAN/ULC-60839-11-1 certifications. The KT-SIG-20KTKS-01 has no environmental or temperature rating listed in the available spec data, and its mullion glass-door mount style suggests an indoor-primary design. For confirmed outdoor deployments, the UA-G3-FLEX-B is the specified choice based on available data.
Do either of these readers support mobile or smartphone-based credentials?
The UA-G3-FLEX-B supports Bluetooth 4.1 and Apple Touch Pass, enabling NFC unlock via iOS and Android devices as listed in its specifications. The KT-SIG-20KTKS-01 lists NFC/13.56 MHz as a supported credential type, but no Bluetooth or specific mobile wallet integration is mentioned in the provided specs. Buyers requiring verified mobile access functionality should confirm mobile credential support with Kantech before specifying the KT-SIG-20KTKS-01.
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