Weekly Cycle
TOMZN 1NO 1NC DIN Rail Weekly 7-Day Digital Time Switch
- Voltage: AC 220V/230V, 12V, 24V, 48V
- Current Rating: 16A Resistive Load
- Mounting: 35mm Standard DIN Rail
Top Trusted Split Core CT Factory & Exporters Serving Tehran
Engineering-grade Non-Invasive Current Transformers, Modular DIN Energy Monitoring, and Protection Controls Engineered for Tehran’s Modernized Commercial Sub-Distribution & Heavy Industrial Grids
Engineered Metering, Split-Core CTs & Automated Timing Solutions
Precision-molded current sensors, din-rail submetering nodes, and programmable duty cyclers designed for frictionless retrofits across Iranian commercial facilities, municipal networks, and suburban manufacturing plants.
Multi-Function
TORT7 10-in-1 Delay-ON Delay-OFF Asymmetric Time Relay
- Timing Span: 0.1s to 10 Days Pulse Range
- Control Mode: Asymmetric Cycler & Interval
- Housing: Self-extinguishing Polycarbonate
Bluetooth BLE
TOMZN Bluetooth Smart Countdown Timer Switch (EasyCon)
- Operating Range: AC 85–265V Wide Input
- Current Capacity: 10A / 30A High Inrush
- Configuration: 28 Groups Timing Loops
Upgraded
TOMZN New Generation Single Phase Weekly Programmable Relay
- Contact Output: 1NO + 1NC Microswitch
- Display: High-contrast Backlit LCD
- Backup: Integrated Lithium Cell Memory
Heavy Duty
TOS6-40 40A Heavy Current Bluetooth Time Control Switch
- Direct Switching: 40A Resistive / Inductive
- Mounting: Dual DIN Rail / Wall Fastening
- Protocol: Low-Latency Bluetooth 5.0
Smart I/O
TOMZN TOS7-B Smart Din-Rail Timer Switch 40A/63A
- Operational Load: 40A / 63A Switching
- App Control: EasyCon Parameter Mapping
- Isolation: 4kV Dielectric Breakdown Barrier
Retrofit CT
Precision Split-Core CT & DIN Digital Multi-Function Meter
- Primary Ratio: 100A–1000A / 5A (0.333V option)
- Core: Grain-Oriented Silicon Steel (CRGO)
- Accuracy: IEC 61869-2 Class 0.5S Compliant
PV & Battery
Solar DC Array Split-String MCB Isolation Breaker 1000V
- Working Voltage: 1000V DC String Potential
- Trip Characteristics: Curve C Non-Polarized Arc
- Integration: Combiner Box & Retrofit Cabinets
24+
Years Engineering Expertise
5,700m²
Audited Production Facility
92+
Skilled Technical Workforce
US$3.3M+
Verified Annual Export Volume
High-Accuracy Split-Core Current Transformers & Power Quality Infrastructure for Tehran
A comprehensive engineering review on non-invasive submetering, harmonic current suppression, and power distribution stabilization across the Iranian electrical ecosystem.
Zero-Downtime Split-Core Retrofits
Modern electrical retrofits across dense commercial sectors in Tehran—such as the Grand Bazaar, Abbas Abad corporate centers, and high-load industrial hubs in Karaj and Shamsabad—cannot accommodate scheduled line outages. Our split-core current transformers feature self-clamping snap-joint mechanisms and high-permeability cold-rolled grain-oriented (CRGO) or nanocrystalline silicon cores. This allows panel builders and retrofit technicians to clamp directly over existing live cables and insulated copper busbars without disconnecting the incoming primary feeder.
Harmonic Saturation & Phase Angle Integrity
Tehran’s industrial distribution networks experience extensive harmonic distortions generated by non-linear loads, high-capacity variable frequency drives (VFDs), and heavy HVAC chiller plant operations. Standard non-oriented electrical steel CTs frequently experience magnetic saturation under distorted 3rd, 5th, and 7th harmonic profiles. Our split-core current transformers are precision-calibrated with minimal phase angle error (<20 minutes of arc) and linear dynamic magnetic flux up to 120% of rated nominal current (In), ensuring strict adherence to Class 0.5S and Class 1.0 metering accuracy.
Built-in Open-Circuit Secondary Protection
Accidental disconnection of secondary loops in conventional solid-core current transformers results in lethal inductive kilovolt spikes capable of causing catastrophic flashovers. Our split-core transformers incorporate dual internal transient voltage suppression (TVS) clamping diode networks across secondary outputs. In the event of an accidental open secondary circuit under full line conditions, the internal clamp safely caps maximum secondary potential beneath 10.5V peak, safeguarding technicians and DIN-rail instrumentation from dielectric puncture.
Strategic Split-Core CT & Power Protection Deployment Across Greater Tehran
Tailored electrical hardware solutions addressing specific infrastructure constraints, high ambient operating temperatures, and sub-metering mandates across Iran’s capital.
Commercial Tower Tenant Energy Allocations
In massive multi-tenant office and retail installations along Valiasr Avenue and Sa'adat Abad, historical buildings rely on unified three-phase switchboards without segregated metering. By coupling our compact mini split-core CTs (with internal mV/5A outputs) with multi-channel DIN-rail energy meters, property operators deploy revenue-accurate submetering without stripping existing raceways or violating local fire compartmentalization protocols.
Industrial Estates & Heavy Machining Substations
Tehran’s industrial corridors, including Payam Free Zone, Shamsabad, and Hashtgerd, face strict seasonal load management under national peak-shaving frameworks. Large-window split-core CTs (ranging up to 160×80mm busbar dimensions) continuously supply analog inputs to supervisory telemetry units, allowing factory energy managers to shed secondary auxiliary loads via automated cyclic time switches before encountering punitive demand penalties.
Distributed Solar PV Strings & Microgrid Tracking
As rooftop photovoltaic arrays proliferate across residential compounds in Northern Tehran and rural outposts surrounding Damavand, our split-core sensors capture bidirectional net-metering metrics. Integrated along DC/AC hybrid inverters, combiners, and automated transfer switches (ATS), our CT nodes track generation yields against grid fluctuations without interrupting critical backup storage loops.
| Parameter / Metric | High-Permeability CRGO Split-Core CT | Nanocrystalline Precision Split-Core | Standard Solid-Core Toroidal CT |
|---|---|---|---|
| Installation Methodology | Clamp-on / Snap-latch without line disconnection | Compact clamp-joint for high-density DIN racks | Requires breaking conductor & cable lug detachment |
| Accuracy Class (IEC 61869-2) | Class 0.5S / Class 1.0 (50/60 Hz) | Class 0.2S / Class 0.5 High Precision | Class 0.5 / Class 1.0 |
| Internal Secondary Safety | Integrated TVS Overvoltage Suppression Diode | Integrated TVS Shunt Clamp (<10.5Vpk) | Unprotected (Destructive kV Flashover Risk) |
| Primary Current Range | 100A to 5000A AC | 5A to 600A AC | 5A to 4000A AC |
| Phase Shift Distortion | < 30 minutes of arc at rated burden | < 15 minutes of arc (ultra-low drift) | < 40 minutes of arc depending on core density |
| Dielectric Withstand Voltage | 3.0 kV AC / 1 min (50 Hz) | 4.0 kV AC / 1 min (50 Hz) | 3.0 kV AC / 1 min (50 Hz) |
Trends Shaping Electrical Metering & Protection Procurement in Tehran
An authoritative analysis of evolving regulatory codes, localized grid characteristics, and supply chain strategies for Iranian distributors and procurement engineers.
Grid Modernization Under TAVANIR Directives
Iran’s Power Generation, Transmission, and Distribution Management Company (TAVANIR) has accelerated the rollout of advanced metering infrastructure (AMI) and demand-side management regulations. Large commercial consumers and heavy manufacturing plants in the Tehran Province are required to modernize their switchgears with high-accuracy recording meters. Because dismantling energized switchboards incurs massive financial losses, demand for certified split-core current transformers that interface directly with digital modbus submeters has experienced unprecedented exponential growth.
Harsh Climatic & Thermal Derating Standards
Tehran’s distinct continental climate presents scorching summers exceeding 42°C, coupled with dry, dust-laden air that gathers inside unsealed distribution cubicles. Standard split-core CTs featuring cheap potting resin regularly crack and suffer magnetic flux leakages under intense thermal cycling. Our split-core units utilize UL94-V0 flame-retardant nylon casings, epoxy-cast vacuum encapsulated windings, and high-temperature wire insulation rated for -25°C to +85°C operation, preventing mechanical embrittlement and measurement drift over decades of continuous service.
Direct-from-Liushi Factory Sourcing Efficiencies
Iranian importers and wholesale distributors navigating Tehran's Naser Khosrow and Lalehzar electrical supply districts increasingly seek direct partnerships with verified Chinese manufacturers. Located in Liushi Town, Wenzhou—China's low-voltage capital—our integrated factory supply ecosystem ensures raw material traceability, specialized copper winding accuracy, rapid containerized shipments via Bandar Abbas, and factory-direct OEM custom labeling that strengthens local brand authority.
Why Tehran Importers & Contractors Choose Zhejiang TMB Electric
Verified Industrial Authority: Operating from our 5,700 m² audited production hub in Liushi, Wenzhou, Zhejiang TMB Electric Co., Ltd. integrates 24 years of specialized manufacturing experience in low-voltage electrical protection, modular switching, and precision metering devices. Assessed on-site by TÜV Rheinland and operating certified quality management systems, our products support global commercial operations exceeding US$ 3.3M annually.
Rigorous Comprehensive Testing Protocols: Every single current transformer, digital timer switch, and automatic transfer switch undergoes stringent multi-stage inspection. Our QA workflow includes incoming grain validation of cold-rolled silicon steel, winding turn-ratio testing, thermal and magnetic trip curve verification, and 3000V/50Hz dielectric withstand safety checks before batch packaging.
Agile Procurement & Custom OEM/ODM Capabilities: We recognize the operational challenges faced by overseas B2B buyers. Starting from flexible minimum order quantities (MOQ from 5 pieces on core stock models) up to full-scale OEM branding, personalized winding ratios (e.g., secondary 5A, 1A, 333mV, or 100mA), and customized enclosure configurations, we provide reliable technical documentation, CE certificates, and rapid manufacturing lead times to support Iran's evolving electrical grid requirements.
Frequently Asked Questions by Iranian Engineers & Importers
Essential answers covering electrical standards, customs clearance documentation, product selection, and installation best practices for split-core CTs.
How do I select between a 5A, 1A, and 333mV secondary output for projects in Tehran?
Selection depends on the distance between the split-core CT and the panel meter. A standard 5A secondary output is recommended for short distances (<2 meters) inside the switchboard cubicle to avoid resistive signal loss. If the measuring transducer or RTU is located in a centralized control room tens of meters away, select a 1A output or a high-impedance 333mV voltage-output CT, which dramatically reduces lead burden and thermal heat generation along secondary control wiring.
Does your factory supply formal test reports and certificates for customs clearance?
Yes. We provide complete factory calibration reports, CE declarations of conformity, IEC 61869-2 test records, and comprehensive on-site facility assessment documents verified by TÜV Rheinland. These standardized technical datasheets ensure unhindered regulatory processing through Iranian inspection agencies and customs clearance authorities at Bandar Abbas and Imam Khomeini International Airport (IKA).
Can split-core CTs be clamped on uninsulated busbars in high-ambient environments?
Yes, our split-core CT housings are injection-molded from heavy-duty, self-extinguishing flame-retardant polybutylene terephthalate (PBT) or reinforced nylon rated UL94-V0. They provide a certified dielectric insulation rating of 3.0 kV to 4.0 kV AC for 1 minute. However, on exposed high-voltage bare copper busbars, we recommend adding insulation sleeving or busbar heat-shrink tubing to guarantee safety margins in unventilated summer environments where internal enclosure temperatures can reach 60°C.
What is the minimum order quantity (MOQ) and sample lead time for custom ratio CTs?
For standard catalog ratios (such as 100/5A, 200/5A, 400/5A, 600/5A, 1000/5A), the trial MOQ is 5 pieces to support engineering validation and laboratory testing. For custom primary window dimensions, special nanocrystalline cores, or customized private-label laser marking, sample production takes 3 to 7 working days, followed by sea container or air courier dispatch.
How do your products handle secondary open-circuit hazards during on-site maintenance?
Unlike conventional current transformers that generate lethal kilovolt arcs when accidentally disconnected under load, our split-core series integrates internal dual transient voltage suppression (TVS) clamping circuitry. If a technician disconnects the secondary cable while the primary phase carries nominal current, the internal protection clamp automatically limits the secondary terminal voltage to a safe threshold beneath 10.5V peak, preventing electrical arcing and dielectric breakdown.
Empower Your Distribution & Submetering Projects in Tehran
Connect directly with our senior application engineering team in Liushi, Wenzhou. Request factory-direct pricing, customized split-core CT dimensional drawings, single-line diagram reviews, and full IEC/CE certification dossiers tailored for Iranian commercial and industrial applications.
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