DDSD2821 STS Prepaid Electricity Meter with Split CIU
STS-compliant single-phase meter with indoor Customer Interface Unit (CIU).
The DDSD2821 is an STS-compliant single-phase prepaid electricity meter featuring a split-unit architecture designed for rental properties, housing developments, and commercial units in Pakistan. The tamper-resistant meter body installs safely in an outdoor electrical panel or utility riser, while the indoor Customer Interface Unit (CIU) provides a convenient numeric keypad and display inside the home. Tenants obtain an encrypted 20-digit STS token and type it into the indoor CIU to replenish electricity credit. An internal latching relay disconnects power automatically when credit depletes and reconnects immediately upon token entry.
Key Technical Highlights
- Split-unit architecture with convenient indoor CIU keypad & display
- 20-digit encrypted STS token standard for reliable recharge
- Audible and visual low-balance warning alerts before disconnection
- Automatic load disconnect on zero balance and reconnection upon recharge
Recharge Architecture
Credit purchase and token entry are two distinct steps: (1) Purchase electricity credit at the estate management desk or authorized vending terminal to receive an encrypted 20-digit STS token. Please note that token purchase produces a 20-digit code, but does not transfer credit over the air. (2) Enter the 20-digit token into the indoor CIU keypad. The CIU synchronizes with the main meter, updating the kWh credit balance and maintaining power.
B2B & project-based supply for landlords, property developers, housing societies, and commercial facilities across Pakistan. Pricing is tailored by order volume, specification, and project deployment scope.
Official commercial proposal includes part numbers, warranty terms, and delivery schedules within 24–48 hours.
Practical Benefits for Landlords & Property Managers
How this solution eliminates utility arrears, simplifies tenant recharge, and protects infrastructure in Pakistan.
Convenient In-Home CIU Keypad
Tenants monitor real-time kWh credit and enter 20-digit recharge tokens inside their premises without accessing high-voltage riser cupboards or outdoor meter boxes.
Automatic Utility Arrears Prevention
Integrated heavy-duty disconnect switch isolates power automatically when credit reaches zero and reconnects instantly upon recharge.
Audible & Visual Low-Credit Warning
Indoor CIU sounds clear warning beeps and visual flashing alerts before balance expires, giving tenants ample time to recharge.
Standardized STS Encryption
Built to the international IEC 62055-41 STS token standard; tokens are uniquely encrypted to the meter serial number to eliminate tampering and fraud.
Technical Specifications
Verified hardware parameters and manufacturer documentation values.
| Parameter | Specification Value |
|---|---|
| Model Designation | DDSD2821 (with indoor CIU) |
| Phase Configuration | Single Phase |
| Architecture | Split-unit (Outdoor meter body + indoor CIU) |
| Rated Voltage | 220V / 230V AC (Single Phase) Note: Hardware dial displays 220V, while datasheet specification table lists 230V nominal. Operates across 220V–230V 50Hz single-phase electrical supply in Pakistan. |
| Rated Current | 5(60)A (base 5A, max 60A continuous) |
| Frequency | 50Hz |
| Accuracy Class | Class 1.0 (IEC 62053-21) |
| Pulse Constant | 1000 imp/kWh |
| Ingress Protection | IP54 |
| Communication Link | CIU interface / utility integration port Note: CIU links directly to meter body for in-home token entry and balance monitoring. |
| Standards Referenced | IEC 62052-11, IEC 62053-21, IEC 62055-41 (STS compliant) Note: Referenced manufacturing design standards. Local certification verification is project-specific. |
| Installation | Wall mounted / enclosure mounted |
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