| Parameter | Value |
|---|---|
| Model | NDZ3T-40H |
| Brand | NADER (LAZZEN) · Jiangsu, China |
| Main Contact Form | 1NO · non-polarized load terminals |
| Operating Voltage Range | DC 24 ~ 1500V |
| Rated Operating Current | 40A (300A continuous withstand) |
| Short-time Withstand Current | 3750A for 30ms |
| Maximum Breaking Current | DC320V / 2000A, 1 operation |
| Breaking Capacity | 40kA (short-circuit co-rating, per listing data) |
| Contact Resistance | ≤ 5mΩ at 40A |
| Control Coil | DC12V / 24V (Uc) · operating DC9-36V · 3.6W · polarized |
| Pick-up / Release Voltage | ≤ 9V / ≥ 1.2V |
| Closing / Opening / Bounce Time | ≤ 35ms / ≤ 20ms / ≤ 5ms |
| Auxiliary Contact (optional) | None / 1NO / 1NC / 1NC+1NO · 2A/DC30V, 3A/AC125V · min. load 100mA/8V |
| Electrical Life | DC500V/300A ×6,000 · DC750V/150A ×1,000 · DC1000V/300A ×300 |
| Mechanical Life | 1,000,000 cycles (1,200 cycles/hour) |
| Insulation / Withstand | 100MΩ @ DC500V · AC3500V 60s (leakage ≤1mA) |
| Impulse Stability | 30g (closed) · 20g (open) · humidity 5%~85% |
| Construction / Weight | Epoxy encapsulated · approx. 460g |
| Certification | CCC · CB · CE · TÜV · UL |
 Epoxy encapsulation series - pinout and footprint compatible with Hongfa HFZ16, TE Connectivity and Schaeffler EV solutions for drop-in replacement |  NEV application map - pre-charge, main, slow/fast-charge, auxiliary/heating contactor positions; NDZ3T-40 covers slow-charge and auxiliary circuits |
 Certified to CCC, CB, CE, TÜV and UL - certificate copies available on request |
| Advantage | Benefit for Your Application |
|---|---|
| ✅ DC1500V Class for Storage Systems | Operating range DC24~1500V with 300A continuous withstand - sized for 1500V-class solar-plus-storage battery clusters and HV DC distribution. |
| ✅ 3750A/30ms Short-Time Withstand | Rides through inverter surge and fault-clearing currents without nuisance damage, with DC320V/2000A single-shot breaking as the backstop. |
| ✅ Non-Polarized Load Terminals | Either terminal can be positive - simpler busbar layout, no polarity wiring errors, and easy swap into existing designs. |
| ✅ Epoxy-Sealed, Low-Power Coil | Epoxy encapsulation blocks dust and condensation for containerized BESS environments; DC12/24V coil draws only 3.6W - gentle on BMS auxiliary supplies. |
| ✅ Optional Auxiliary Contact | Field-selectable None / 1NO / 1NC / 1NC+1NO feedback contact (2A/DC30V) for weld-detect and status feedback in series strings - minimum load down to 100mA/8V. |
| ✅ Full Certification & Family Coverage | CCC · CB · CE · TÜV · UL, plus a 10~600A family (NDZ3 / NDZ3X / NDZ3T / NDZ3AT) so pre-charge, main and auxiliary relays can share one brand and one footprint logic. |
Typical switching points for the NDZ3T-40H across high-voltage DC systems.
 Energy Storage Systems Battery cluster main & pre-charge switching in 1500V-class BESS containers and cabinets |  Solar / PV & PCS DC side switching in string inverters, combiner boxes and power conversion systems |
 EV Charging Slow-charge and auxiliary contactor duty in charging piles and DC charging stations |  Industrial DC & NEV Auxiliary/heating circuits and BDU paths in electric vehicles and industrial DC equipment |
| Item | Detail |
|---|---|
| Brand / Origin | NADER by LAZZEN (Zhejiang/Changzhou, China) · Jiangsu, China |
| Ordering Model | NDZ3T-40H/1500V - 40A, DC24~1500V, coil DC12V or DC24V (as pictured: DC24V), flange mounting |
| Configurable Options | Auxiliary contact: none / 1NO / 1NC / 1NC+1NO · coil 12V / 24V |
| Companion Models | NDZ3T-20/-40 (DC750/1000V) · NDZ3X-40B (DC1000V) · NDZ3AT-120~600 (DC1000~1500V) - full 10~600A family for pre-charge/main/aux roles |
| MOQ | Flexible - contact sales for sample & volume pricing |
| Lead Time | Typically 7-15 days (confirm with sales) |
| Payment | T/T, Trade Assurance, etc. (confirm with sales) |
| Warranty | 1 year |
Q1. Where is the NDZ3T-40H typically used?
A: As main or pre-charge contactor in 1500V-class energy-storage battery clusters, solar/PCS DC circuits, EV charging stations and industrial DC equipment - anywhere a 40A / up to DC1500V switching point is needed.
Q2. What does "non-polarized" mean for installation?
A: The load terminals have no fixed polarity - either can be connected to positive. This simplifies busbar design and eliminates polarity wiring errors when integrating into existing systems.
Q3. How much surge can it survive?
A: Short-time withstand is 3750A for 30ms with 300A continuous, and it can break DC320V/2000A once as an emergency backstop. Short-circuit co-rating per listing data is 40kA.
Q4. What coil options and drive requirements apply?
A: Polarized coil at DC12V or 24V rated, operating window DC9-36V, 3.6W. Pick-up ≤9V, release ≥1.2V; close/open/bounce times ≤35/≤20/≤5ms. Note: the coil is polarity-sensitive - observe the marked coil polarity.
Q5. Is an auxiliary contact available?
A: Yes - as an option in none / 1NO / 1NC / 1NC+1NO configurations, rated 2A/DC30V or 3A/AC125V, minimum switchable load 100mA/8V, typically used for weld detection and status feedback.
Q6. Can it replace other brands' models?
A: The Nader epoxy series is footprint-compatible with Hongfa HFZ16, TE Connectivity and Schaeffler EV solutions, enabling drop-in replacement. Send us your current model for a cross-reference.
