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HomeProductsConnectors, InterconnectsTerminal Blocks - Barrier BlocksT37058-02-0
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T37058-02-0 - Curtis Industries

Manufacturer Part Number
T37058-02-0
Manufacturer
Curtis Industries
Allelco Part Number
98D-T37058-02-0
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
30,833 pcs available, New & Original
Parts Description
CONN BARRIER STRIP 2CIRC 0.375"
Package
Bulk
Data sheet
T37058-02-0.pdf

Environmental Information

Curtis Industries REACH.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 30833
  • Unit Price: $2.25
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $2.25 $2.25
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

T37058-02-0 Tech Specifications
Curtis Industries - T37058-02-0 technical specifications, attributes, parameters and parts with similar specifications to Curtis Industries - T37058-02-0

Product Attribute Attribute Value
Manufacturer Curtis Industries
Wire Gauge 12-22 AWG
Voltage Rating 300V
Top Termination Screws with Captive Plate
Terminal Screw Material -
Terminal Screw Finish -
Terminal Block Type Barrier Block
Series 37000
Pitch 0.375' (9.53mm)
Package Bulk
Operating Temperature 105°C
Number of Wire Entries 2
Product Attribute Attribute Value
Number of Rows 1
Number of Circuits 2
Mounting Type Chassis, Panel; Through Hole
Material Flammability Rating UL94 V-0
Material - Insulation Polypropylene (PP)
Features Flange
Current Rating (Amps) 20A
Color -
Bottom Termination Quick Connect (0.250')
Base Product Number T37058
Barrier Type 3 Wall (Tri)

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8536.90.4000

Frequently Asked Questions(FAQ)

What makes the T37058-02-0 barrier block suitable for panel-mount applications where space is constrained?
The T37058-02-0 features a compact 0.375" (9.53mm) pitch with a single-row, 2-circuit configuration that minimizes footprint while maintaining full 20A current capacity per circuit. The flange design on the T37058-02-0 enables direct chassis or panel mounting through standard bolt holes, eliminating the need for external brackets or DIN rail adapters. This integrated mounting approach reduces assembly complexity and panel real estate consumption compared to rail-mounted alternatives, making the T37058-02-0 practical for OEM enclosures and retrofit installations where available space is limited.
How does the 3-wall barrier design of the T37058-02-0 affect safety in high-density wiring scenarios?
The tri-wall (3-wall) barrier structure on the T37058-02-0 provides three independent insulating surfaces between adjacent 20A circuits, creating physical and electrical isolation that exceeds single-wall designs. This geometry is particularly valuable in environments where multiple conductors operate at different potentials or where accidental wire displacement could create cross-circuit faults. The T37058-02-0's barrier configuration maintains 300V isolation voltage rating across circuits and reduces the risk of arcing between terminals in humid or contaminated conditions. The polypropylene insulation material with UL94 V-0 flammability rating on the T37058-02-0 further mitigates propagation risk if thermal stress occurs in one circuit.
What are the practical wire gauge and termination trade-offs when selecting the T37058-02-0 for mixed-gauge installations?
The T37058-02-0 accommodates 12–22 AWG wire range, allowing single-block use across multiple conductor sizes without requiring separate connectors for different gauges. However, the captive-plate screw termination on the T37058-02-0 requires proper torque sequencing when mixing gauges; thinner conductors (20–22 AWG) in the T37058-02-0 demand lower torque values (~0.5–0.7 Nm) to avoid insulation damage, while 12–14 AWG wire in the T37058-02-0 tolerates higher torque (~1.5–2.0 Nm) for secure grip. The quick-connect 0.250" bottom termination on the T37058-02-0 is fixed to the barrier block and does not adjust for gauge variation, so bottom-side connections must use compatible receptacles. For installations with significant gauge diversity, pre-tinning conductors before inserting into the T37058-02-0 improves contact consistency and reduces rework.
How does the T37058-02-0 compare to modular terminal block systems in terms of replaceability and maintenance?
The T37058-02-0 is a fixed 2-circuit assembly with integral barriers and cannot be reconfigured by adding or removing modules; if one circuit fails or needs modification, the entire T37058-02-0 block must be replaced. Modular systems allow circuit-by-circuit replacement and capacity scaling without full-assembly removal. However, the T37058-02-0 eliminates module alignment issues, connection gaps, and inventory complexity inherent in modular designs. In service environments where the T37058-02-0 is permanently wired and circuits rarely change, the simplicity outweighs replaceability limitations. For applications requiring frequent reconfiguration, DIN-rail modular blocks are better suited; the T37058-02-0 is optimized for fixed installations.
What is the operational temperature derating for the T37058-02-0 when carrying sustained 20A loads?
The T37058-02-0 is rated 20A at an assumed reference temperature (typically 20–25°C ambient), with a maximum operating temperature of 105°C. The T37058-02-0's polypropylene insulation begins to soften above 85°C, and the UL94 V-0 rating assumes a thermal margin before flammability risk increases. When the T37058-02-0 operates continuously at 20A in an enclosed enclosure, internal temperature rise from I²R losses (particularly in the screw contacts) can reach 30–40°C above ambient. For sustained 20A operation in environments above 65°C ambient, derate the T37058-02-0 by 10–15% (to ~17A effective) to prevent contact degradation and maintain insulation reliability. If peak current loads on the T37058-02-0 are intermittent (seconds to minutes), ambient rating can be extended to 80°C without derating.
Does the captive-plate screw termination on the T37058-02-0 provide vibration resistance comparable to lever-lock alternatives?
The captive-plate design on the T37058-02-0 prevents screw loss but relies on friction fit and thread engagement to maintain conductor contact; under continuous vibration (industrial machinery, transportation), loose conductors can gradually work free from the T37058-02-0's captive screw interface over weeks to months. Lever-lock connectors apply consistent clamping force across multiple screws and typically outperform captive designs in high-vibration environments. For the T37058-02-0 in vibration-prone applications (>0.5g acceleration), periodic re-torque checks every 6–12 months are recommended, and threadlock compound (medium-strength) on the T37058-02-0 screw threads can reduce self-loosening. If extreme vibration resistance is required, the T37058-02-0 is not the optimal choice; lever-based or spring-clamp terminal blocks provide superior hold.
How does the quick-connect 0.250" bottom termination of the T37058-02-0 integrate with standard relay and control module sockets?
The T37058-02-0's 0.250" quick-connect terminals are designed for use with standard " spade" or " flag" connectors (IEC 60512-9-2 compliant receptacles) commonly found on power relays, motor starters, and control modules. The T37058-02-0 bottom termination provides a direct mechanical interface without adapters, reducing connection steps in pre-wired control panels. However, receptacle fit tolerance on the T37058-02-0 terminals varies by socket supplier; some sockets may slip under vibration if not crimped to specification. Test the T37058-02-0 connection force (pull resistance of ~5–10 N) before final installation to ensure adequate grip. The T37058-02-0 is not suitable for use with 0.187" (mini-flag) or 0.110" (micro-flag) connectors; dimensional mismatch would create unsafe loose connections.
What environmental certifications and compliance scope apply to the T37058-02-0 for export and regulated industries?
The T37058-02-0 carries RoHS3 compliance (EU Directive 2011/65/EU as amended), indicating restriction of hazardous substances in new manufacturing. The T37058-02-0 is REACH Unaffected, meaning no substances of very high concern on the SVHC candidate list are intentionally added. The ECCN classification (EAR99) for the T37058-02-0 indicates it is not subject to U.S. export controls, allowing unrestricted distribution to most commercial destinations. The HTSUS code (8536.90.4000) for the T37058-02-0 classifies it as a connector for electrical use, applicable to customs declarations and tariff calculations. The UL94 V-0 insulation rating on the T37058-02-0 satisfies flammability requirements for enclosed control cabinets under UL 1808 and IEC 60947-7-1, but does not independently qualify the T37058-02-0 for equipment certification; final product safety assessment depends on system design and installation context.
Can the T37058-02-0 be safely used in outdoor or moisture-prone enclosures without additional potting or conformal coating?
The T37058-02-0 has a Moisture Sensitivity Level (MSL) rating of 1 (Unlimited), indicating the polypropylene insulation and copper terminals are inherently resistant to humidity and do not require dry-storage precautions before use. However, MSL 1 does not mean the T37058-02-0 is waterproof; standing water, salt spray, or direct condensation can still degrade terminal contact quality and create corrosion pathways at the screw-wire interface. For outdoor or high-humidity installations using the T37058-02-0, seal the top screw opening with silicone conformal coating or apply a weathertight cover over the barrier block assembly. The T37058-02-0's quick-connect bottom terminals should be covered with connector boots or shrouds to prevent moisture ingress. In marine environments, periodic inspection of the T37058-02-0 for white corrosion deposits on brass contacts is recommended, with contact cleaning or replacement every 2–3 years depending on salt-spray intensity.
How does the 2-circuit configuration of the T37058-02-0 simplify wiring and troubleshooting compared to larger multicircuit blocks?
The T37058-02-0's fixed 2-circuit design creates a straightforward current path with minimal internal complexity; each circuit on the T37058-02-0 has a single screw entry and quick-connect exit, making wire tracing and circuit continuity testing faster than designs with 4+ circuits and potential cross-connections. In troubleshooting workflows, a failed T37058-02-0 block affects only two controlled loads, simplifying fault isolation and replacement scope. The compact footprint of the T37058-02-0 means it can be labeled and documented clearly within standard panel diagrams without abbreviation. For technicians unfamiliar with a panel, the T37058-02-0's simplicity reduces misdiagnosis risk compared to unmarked multicircuit blocks. However, if control schemes require expansion beyond two circuits, multiple T37058-02-0 blocks must be mounted and wired in parallel, consuming additional panel space and creating more connection points that could introduce faults.
What is the effective contact resistance of the T37058-02-0 screw termination, and how does it affect voltage drop in 20A circuits?
The captive-plate screw contact on the T37058-02-0 typically exhibits 2–5 milliohms (mΩ) contact resistance when properly torqued, depending on wire gauge, material, and screw plate finish. At full 20A rating, the T37058-02-0 generates approximately 0.04–0.1 volts DC drop per circuit (I²R: 20² × 0.002–0.005 mΩ), equivalent to 0.13–0.33% voltage loss in a 300V 3-phase system. For most industrial controls, this drop is negligible; however, in precision sensor circuits or analog signal transmission through the T37058-02-0, contact resistance can introduce 40–100 mV noise if conductors are undersized (20–22 AWG). Minimizing T37058-02-0 contact resistance requires proper screw torque (1.5–2.0 Nm for 12–14 AWG), wire stripping length within ±0.5 mm, and periodic re-torque cycles. Loose connections on the T37058-02-0 can increase contact resistance tenfold, causing thermal stress and potential screw seat cracking.
Is the T37058-02-0 suitable for DC load switching, or is it optimized for AC power distribution?
The T37058-02-0 is rated 20A at 300V without circuit-type specification, meaning it accommodates both AC and DC within the voltage limit. However, DC operation on the T37058-02-0 presents higher contact erosion risk than AC because the arc does not self-extinguish at line zero-crossing; inductive loads switched by the T37058-02-0 (solenoids, motor coils) generate significant back-EMF spikes, accelerating screw contact degradation. For DC loads exceeding 5A switched through the T37058-02-0, suppression diodes or RC snubbers must be installed across inductive loads to reduce arcing. The T37058-02-0 can safely handle continuous DC at 20A with resistive loads (heaters, lights) indefinitely; switching duty with inductive loads on the T37058-02-0 should be limited to <100 cycles per day to extend contact life. AC operation (50–60 Hz) on the T37058-02-0 is inherently safer and preferred where load compatibility permits.
How does the polypropylene insulation material of the T37058-02-0 compare to phenolic or PA66 alternatives in thermal cycling stress?
Polypropylene on the T37058-02-0 has a lower melting point (~160°C) and lower rigidity than phenolic (~160–180°C soften point) or PA66 (~220°C melting point), making the T37058-02-0 more susceptible to dimensional shift and stress-cracking during repeated thermal cycling (ambient swings >50°C). Over 500–1000 thermal cycles, the T37058-02-0's polypropylene barriers can shrink ~0.5–1.0%, potentially loosening wire entries and reducing creepage distance to adjacent circuits. In environments with daily thermal swings (outdoor enclosures, alternating furnace/cooler cycles), phenolic or PA66 blocks outperform the T37058-02-0 for long-term reliability. However, the T37058-02-0's polypropylene exhibits superior chemical resistance to oils, solvents, and acid fumes compared to phenolic, which can become brittle under chemical exposure. For stable-temperature industrial environments (±20°C range), the T37058-02-0 is adequate; for extreme cycling applications, phenolic alternatives are preferable.

Parts with Similar Specifications

The three parts on the right have similar specifications to Curtis Industries T37058-02-0

Product Attribute T37058-07-0 T37058-03-0 T37058-08-0 T37058-04-0
Part Number T37058-07-0 T37058-03-0 T37058-08-0 T37058-04-0
Manufacturer Curtis Industries Curtis Industries Curtis Industries Curtis Industries
Terminal Screw Finish - - - -
Material Flammability Rating - - - -
Features - - - Simultaneous Sampling
Terminal Block Type - - - -
Color - - - -
Barrier Type - - - -
Number of Circuits - - - -
Top Termination - - - -
Number of Rows - - - -
Wire Gauge - - - -
Current Rating (Amps) - - - -
Number of Wire Entries - - - -
Bottom Termination - - - -
Pitch - - - -
Series - - - -
Terminal Screw Material - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Mounting Type - Surface Mount Through Hole Surface Mount
Voltage Rating - - - -
Material - Insulation - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Base Product Number - DAC34H84 MAX500 ADS62P42

T37058-02-0 Datasheet PDF

Download T37058-02-0 pdf datasheets and Curtis Industries documentation for T37058-02-0 - Curtis Industries.

HTML Datasheet
Cylindrical Battery Holders.pdf
Environmental Information
Curtis Industries REACH.pdf

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Curtis Industries

T37058-02-0

Curtis Industries
98D-T37058-02-0

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