WiFi + Bluetooth Connectivity
WiFi cloud communication for remote operation, with Bluetooth CIU connection for local recharge and data access.
DDSY/U353 Single-Phase Prepayment Meter with WiFi and Bluetooth
DDSY/U353 is a single-phase two-wire prepayment keyboard meter (wall-mounted) with WiFi and Bluetooth communication. It features a built-in magnetic latching relay for pay-before-use, remote meter reading, remote recharge, remote balance clearing, overpower tripping and automatic tripping on balance exhaustion. CIU can connect via Bluetooth for data viewing and token entry. Class 1.0 accuracy.
Wall / Suspension Mounted
1P2W Direct Connection
WiFi + Bluetooth
5(60) A Maximum current
220 V Rated voltage
Class 1.0 Active energy accuracy
−20°C to +70°C Operating temperature
Product Highlights
WiFi Smart Prepayment Meter with Bluetooth Connectivity
Class 1.0 Active Energy Accuracy
Class 1.0 accuracy with pay-before-use metering for residential and commercial prepayment applications.
Remote Recharge & Token Input
Supports remote recharge via platform/app and 20-digit token input for offline top-up.
Magnetic Latching Relay
Built-in relay supports prepaid load control, remote switching and automatic disconnection after credit exhaustion.
Power Protection
Provides overload, overvoltage and undervoltage protection with automatic relay control.
Bluetooth CIU Connection
Bluetooth-enabled CIU connection allows remote data viewing and token input without direct meter access.
Applications
Applications and Selection Guidance
Technical Specifications
Technical Specifications
| Voltage | 220 V |
| Frequency | 50 Hz |
| Rated current | 5(60) A |
| Start current | 0.4% Ib |
| Pulse constant | 1000 imp/kWh |
| Power consumption | < 2 W / < 10 VA |
| Active energy accuracy | Class 1.0 |
| Communication interface | WiFi + Bluetooth + RS485/IR |
| WiFi | 2.4 GHz band, YTL-BUS protocol, cloud connectivity |
| Bluetooth | CIU connection for remote data viewing and token entry |
| RS485/IR | Parameter setting and firmware upgrade |
| LCD display | 6+2, automatic scrolling |
| Metering function | Measures voltage, current, active/reactive power, frequency, power factor, total active/reactive energy |
| Prepaid function | Pay-before-use, remote recharge, remote meter reading, remote balance clearing |
| Recharge | 20-digit token entry or APS app remote recharge |
| Load control | Built-in magnetic latching relay: overpower tripping, auto tripping on balance exhaustion |
| Protection | Overload, overvoltage, undervoltage protection |
| Anti-tamper | Open cover detection, power theft status codes |
| Operating temperature | −20°C to +70°C |
| Relative humidity | < 75% |
| Applicable standards | IEC 62052-11 / IEC 62053-21 / IEC 62055-41 / GB/T 17215.321 / GB/T 17215.301 |
Structure & Dimensions
YTL DDSY/U353 Dimensions & Wiring
Dimensions
Wiring
FAQ
Product FAQ
What is DDSY/U353?
DDSY/U353 is a single-phase two-wire prepayment keyboard meter (wall-mounted) with WiFi and Bluetooth communication. It features a built-in magnetic latching relay for pay-before-use, remote meter reading, remote recharge, remote balance clearing, overpower tripping and automatic tripping on balance exhaustion. CIU can connect via Bluetooth for data viewing and token entry. Class 1.0 accuracy.
What operation modes does DDSY/U353 support?
WiFi (2.4 GHz, YTL-BUS) for cloud connectivity, Bluetooth for CIU connection, and RS485/IR for parameter setting and firmware upgrade.
How is recharge performed?
Remote recharge via APS prepayment system/app, or manual 20-digit token entry on the keyboard when signal is poor.
What is the certification/standard basis?
Complies with IEC 62052-11, IEC 62053-21, IEC 62055-41 and related standards.
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