Description
SECURE 104‑80(45) 400/5A – Class 1 Current Transformer for LV Metering & Energy Monitoring
The SECURE 104‑80(45) is a compact, busbar-mount current transformer from SECURE Meters Ltd., one of India’s most trusted names in energy metering and measurement. With a 400A primary, 5A secondary, and 10VA rated burden, this CT is purpose-built for use with energy meters, transducers, power analysers, and protective relays in low-voltage industrial and commercial installations. Its Class 1 accuracy — certified to IEC 61869‑2 and IS 16227‑2 — ensures dependable measurement for both billing and monitoring applications.
Key Features
- Class 1 Accuracy: Complies with IEC 61869‑2 and IS 16227‑2 — suitable for energy metering and billing panels
- 400A / 5A Ratio: Compatible with standard 5A secondary energy meters, transducers, and protection relays
- 10VA Rated Burden: Handles practical wiring burdens without affecting accuracy
- Wide Voltage Rating: System voltage up to 720V; dielectric test at 4kV @ 50Hz for 1 minute
- Ø80mm Aperture, 104mm Wide: Fits standard busbars; compact 45mm depth saves panel space
- UL94 V-0 Polycarbonate Case: Flame-retardant, self-extinguishing material; IP-20 rated for indoor use
- Finger-Safe M4 Dual Screw Terminals: Hinged and sealable cover prevents accidental contact and enables tamper-evident installation
- Shorting Link Provision: Allows safe disconnection of the secondary circuit during maintenance without open-circuit hazard
- Flexible Mounting: Busbar, wall, or cable mount; DIN rail base available as optional accessory
- 50 / 60 Hz Compatible: Suitable for both Indian 50Hz grids and 60Hz export or special installations
Technical Specifications
| Parameter | Value |
|---|---|
| CT Model | 104‑80(45) Series |
| Primary Current | 400 A |
| Secondary Current | 5 A |
| Rated Burden | 10 VA |
| Accuracy Class | Class 1 (IEC 61869‑2 / IS 16227‑2) |
| Frequency | 50 / 60 Hz |
| Max System Voltage | 720 V |
| Dielectric Test Voltage | 4 kV @ 50 Hz, 1 minute |
| Dimensions | 104 mm (W) × 45 mm (D) |
| Aperture | Ø ~80 mm |
| Case Material | UL94 V-0 Flame-Retardant Polycarbonate |
| Protection Class | IP-20 |
| Terminal Type | Dual M4 Screw, Hinged + Sealable Cover |
| Mounting | Busbar / Wall / Cable (DIN rail optional) |
| Special Features | Shorting link, finger-safe terminals |
| Country of Origin | India |
Typical Applications
- Main LV distribution boards and electrical panels
- Energy metering and billing systems (MSEDCL, TNEB, HT/LT installations)
- Power monitoring and SCADA systems
- Switchgear and MCC panels
- Industrial automation and motor control centres
- Commercial buildings, malls, and IT parks
- Utility substations and feeder pillars
The SECURE 104‑80(45) is stocked at Shansen Enterprises, Coimbatore. Contact us via WhatsApp or email to confirm availability, get a datasheet, or request bulk pricing for your panel-building or project requirements.
FAQ (Frequently asked questions)
Q1: What is the ratio of the SECURE 104‑80(45) current transformer?
The SECURE 104‑80(45) has a primary current of 400A and a secondary output of 5A, giving a transformation ratio of 400:5 (or 80:1). It is designed for use with standard 5A secondary energy meters and transducers.
Q2: What accuracy class does this CT carry and which standard governs it?
It is rated Class 1 accuracy, compliant with IEC 61869‑2 and the equivalent Indian standard IS 16227‑2. Class 1 means the ratio error does not exceed ±1% at rated current, making it suitable for revenue metering and energy billing applications.
Q3: What is the rated burden of the SECURE 104‑80(45) CT?
The rated burden is 10 VA. This covers the combined impedance of the connected meter, wiring, and terminal resistance. Exceeding the rated burden will degrade accuracy class performance.
Q4: What is the maximum busbar or cable size that fits through the aperture?
The aperture diameter is approximately 80mm, which accommodates standard LV busbars and large-diameter cable bundles typically used in 400A feeder circuits. Always verify your busbar dimensions before installation.
Q5: Is this current transformer suitable for use in 415V, 3-phase industrial panels?
Yes. The SECURE 104‑80(45) is rated for a maximum system voltage of 720V, well above the 415V (line-to-line) or 240V (line-to-neutral) of standard Indian 3-phase LV systems. It can also be used in 600V-class industrial installations.
Q6: What does the shorting link feature do?
The shorting link short-circuits the secondary terminals before disconnecting the burden (meter or relay). This is a critical safety feature — an open-circuited CT secondary at load can generate dangerously high voltages. The shorting link prevents this during maintenance or meter replacement.
Q7: Can I mount this CT on a DIN rail inside a panel?
The standard unit supports busbar, wall, and cable mounting. An optional DIN rail base is available as a separate accessory. Confirm availability of the DIN rail base when ordering.
